Move the "plugins" correction into a Festival-specific switch.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14956 a1c6a512-1295-4272-9138-f99709370657

tools/voice.pl

@@ -130,8 +130,12 @@ sub correct_string {
         $string =~ s/ID3/I D 3/g;
 
         case "english" {
+            switch($$tts_object{"name"}) {
+                case "festival" {
                     $string =~ s/plugin(s?)/plug-in$1/ig;
                 }
+            }
+        }
         case "deutsch" {
             # for all german engines (e.g. for english words)
             $string =~ s/alkaline/alkalein/ig;