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

include/SDL3/SDL_scancode.h

@@ -434,5 +434,3 @@ typedef enum
 } SDL_Scancode;
 
 #endif /* SDL_scancode_h_ */
-
-/* vi: set ts=4 sw=4 expandtab: */