Remove the duplicated marcelo voice.

espeak-ng-data/voices/!v/marcelo (2)

-?language variant
-name Marcelo
-
-pitch  65 115
-
-formant 0 65 161 35
-formant 1 75 131 65
-formant 2 90 60 40
-formant 3 59 50 55
-formant 4 69 65 35
-formant 5 69 60 25
-formant 6 59 60 35
-formant 7 149 0 10
-formant 8 199 0 90
-voicing 135
-consonants 115 120
-