Fix Quenya ⟨ch⟩ pronunciation

Appendix E of The Lord of the Rings describes it as “the sound heard in
bach (in German or Welsh)”; I think that means [χ], not [x] (voiceless
uvular rather than velar fricative), and out of the base1 phonemes,
[[X]] is closer to that than [[x]]. (The German phonemes redefine [[x]]
to be closer to [[X]], if I’m not mistaken, but I don’t think we need
that. Note also that we actually need [[x]] for Quenya ⟨ht⟩.)

dictsource/qya_rules

@@ -36,7 +36,7 @@
 	// recall that ch was replaced with x earlier
 
 .group x
-	x	x
+	x	X
 
 .group d
 	d	d

dictsource/sjn_rules

@@ -34,7 +34,7 @@
 	// recall that ch was replaced with x earlier
 
 .group x
-	x	x
+	x	X
 
 .group d
 	d	d

tests/language-pronunciation.test

@@ -194,7 +194,7 @@ test_phon sd "s'Indhi b'o:li; 'Ind.o: jo:R'Vpi xa:nd'a:n s'a~: t[a:l'Vq R,@k#@nd
 J'Vnhn t['e: ,aRb'i: bo:l'i:;a J'o: b'I t[@m'a:m v'Vd.o: as'VR ,a:he:
 h'Ina v'aqt s'Indhi b'o:li s'Indh J'e: m'Vk# b'o:li_! 'ae~ d,@f@t['VRi z@b'a:n ,a:he:" "سنڌي ٻولي انڊو يورپي خاندان سان تعلق رکندڙ آريائي ٻولي آھي، جنھن تي عربي ٻوليءَ جو بہ تمام وڏو اثر آهي. هن وقت سنڌي ٻولي سنڌ جي مک ٻولي ۽ دفتري زبان آھي." "Arab"
 test_phon si "t'aw@t st#'a:n@ k'i:p@j,@kin w'a:rta: w'u: s'ul.u p'ipiri:m s'ah@ d'e:s@p,a:l@n@ p'akS@ k r'ija:k,a:ri:n 'at@r@ '&tiwu: g'&t.um h'e:tuwen 'ek 'ajeku m'ij@gos k'i:p@ d'eneku t'uwa:l@ l'aba: t'ibe:" "තවත් ස්ථාන කීපයකින් වාර්තා වූ සුළු පිපිරීම් සහ දේශපාලන පක්ෂ ක්‍රියාකාරීන් අතර ඇතිවූ ගැටුම් හේතුවෙන් එක් අයෙකු මියගොස් කීප දෙනෙකු තුවාල ලබා තිබේ." "Sinh"
-test_phon sjn "'alf 'aman 'amaRT 'amon 'aRag,oRn aRn'OIdi;,ad 'aRved,ui bel'eRi;,and b'oRom,iR bRag'ollax bR'eTil bRiT'ombaR bR'uinen k'aIR kaR'aDRas k,elebR'i:an kRiss'aEgRim d'eneT,oR dR'eNgist d'u::n ekT'eli;,on 'emyn eR'i;ad,oR f'ean,oR find'uilas f'iNgon fiNg'olfin fin'aRfin f'oRox,el g'alaD,on gal'adRi;,el gR'ond gw'aIhiR j'aRwaIn 'imladR,is j'oReT iT'ili;,en loTl'o:Ri;,en m'enegR,oT miT'eITel miTR'andiR moR'annon m'oRi;,a n'aRgoTR,ond oR'offin osg'ili;,aT pal'anti:R p,alant'i:Ri pel'ennoR p,eRi;'annaT sil'ivRen ToR'ondoR" "alph Aman Amarth Amon Aragorn Arnoediad Arvedui Beleriand Boromir Bragollach Brethil Brithombar Bruinen Cair Caradhras Celebrían Crissaegrim Denethor Drengist dûn Ecthelion Emyn Eriador Fëanor Finduilas Fingon Fingolfin Finarfin Forochel Galadhon Galadriel Grond Gwaihir Iarwain Imladris Ioreth Ithilien Lothlórien Menegroth Mitheithel Mithrandir Morannon Moria Nargothrond Orophin Osgiliath Palantír Palantíri Pelennor Periannath Silivren Thorondor" "Sindarin"
+test_phon sjn "'alf 'aman 'amaRT 'amon 'aRag,oRn aRn'OIdi;,ad 'aRved,ui bel'eRi;,and b'oRom,iR bRag'ollaX bR'eTil bRiT'ombaR bR'uinen k'aIR kaR'aDRas k,elebR'i:an kRiss'aEgRim d'eneT,oR dR'eNgist d'u::n ekT'eli;,on 'emyn eR'i;ad,oR f'ean,oR find'uilas f'iNgon fiNg'olfin fin'aRfin f'oRoX,el g'alaD,on gal'adRi;,el gR'ond gw'aIhiR j'aRwaIn 'imladR,is j'oReT iT'ili;,en loTl'o:Ri;,en m'enegR,oT miT'eITel miTR'andiR moR'annon m'oRi;,a n'aRgoTR,ond oR'offin osg'ili;,aT pal'anti:R p,alant'i:Ri pel'ennoR p,eRi;'annaT sil'ivRen ToR'ondoR" "alph Aman Amarth Amon Aragorn Arnoediad Arvedui Beleriand Boromir Bragollach Brethil Brithombar Bruinen Cair Caradhras Celebrían Crissaegrim Denethor Drengist dûn Ecthelion Emyn Eriador Fëanor Finduilas Fingon Fingolfin Finarfin Forochel Galadhon Galadriel Grond Gwaihir Iarwain Imladris Ioreth Ithilien Lothlórien Menegroth Mitheithel Mithrandir Morannon Moria Nargothrond Orophin Osgiliath Palantír Palantíri Pelennor Periannath Silivren Thorondor" "Sindarin"
 test_phon sk "k'r:d;el^ St;'astni:Q d;'atl^ow 'utSi: pR'i;u:st;i: v'a:hu m'l:kveho k'on^a 'ophRi:zat; k'uoRu_:_: a ZR'at; tS'eRstve: m'eso
 p'et;ti:Zdn^,ove: v'l:tSata: n'eRvo:zn^e St;'ekaju: n'amu,ojho d;'atl^a_! v_ t'r:n^i:" "Kŕdeľ šťastných ďatľov učí pri ústí Váhu mĺkveho koňa obhrýzať kôru a žrať čerstvé mäso. Päťtýždňové vĺčatá nervózne štekajú na môjho ďatľa v tŕní." "Latn"
 test_phon sl "xiSn'i:tSin bR'a:tEts uzg'a:ja p'o:wZE p'o:t fik'u:sOm" "Hišničin bratec vzgaja polže pod fikusom." "Latn"