Remove the voice files that have the same names as languages.

espeak-ng-data/voices/!v/jbo

@@ -1,4 +0,0 @@
-name lojban
-language jbo
-
-speed 80   // speed adjustment, percentage

espeak-ng-data/voices/!v/nci

@@ -1,7 +0,0 @@
-name nahuatl - classical
-language nci
-gender male
-
-intonation 3
-stressrule 2
-stressLength  190  190  200  200  0  0  220  240