Remove ascii theme switching since we don't need it anymore with the updated ascii rasterizer

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

apps/wolf_3d_cli/bin/main.dart

@@ -67,10 +67,6 @@ void main() async {
       exitCleanly(0);
     }
 
-    if (bytes.contains(9)) {
-      rasterizer.activeTheme = AsciiThemes.nextOf(rasterizer.activeTheme);
-    }
-
     input.handleKey(bytes);
   });