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_platform.h

@@ -238,5 +238,3 @@ extern DECLSPEC const char * SDLCALL SDL_GetPlatform (void);
 #include <SDL3/SDL_close_code.h>
 
 #endif /* SDL_platform_h_ */
-
-/* vi: set ts=4 sw=4 expandtab: */