[mugenizer] don't touch commented lines

who knows, maybe it's another template line and we don't want to change
it

karaoke-adjust-1sec.lua

@@ -111,7 +111,7 @@ function mugenizer(subs)
             styles = styles + 1
         end
 
-        if line.class == "dialogue" then
+        if line.class == "dialogue" and not line.comment then
             if first == nil then
                 first = i
             end