Removed the vi format comments from the source

Vim users can use the [editorconfig plugin](https://github.com/editorconfig/editorconfig-vim) to automatically set tab spacing for the SDL coding style.

Fixes https://github.com/libsdl-org/SDL/issues/6903

build-scripts/gen_audio_channel_conversion.c

@@ -442,9 +442,6 @@ int main(void)
     }
 
     printf("};\n\n");
-    printf("/* vi: set ts=4 sw=4 expandtab: */\n\n");
 
     return 0;
 }
-
-/* vi: set ts=4 sw=4 expandtab: */