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

src/file/SDL_rwops.c

@@ -873,5 +873,3 @@ SDL_WriteBE64(SDL_RWops *dst, Uint64 value)
     const Uint64 swapped = SDL_SwapBE64(value);
     return (SDL_RWwrite(dst, &swapped, sizeof(swapped)) == sizeof(swapped)) ? 1 : 0;
 }
-
-/* vi: set ts=4 sw=4 expandtab: */

src/file/cocoa/SDL_rwopsbundlesupport.m

@@ -63,5 +63,3 @@ FILE *SDL_OpenFPFromBundleOrFallback(const char *file, const char *mode)
 }
 
 #endif /* __APPLE__ */
-
-/* vi: set ts=4 sw=4 expandtab: */

src/file/n3ds/SDL_rwopsromfs.c

@@ -92,5 +92,3 @@ TryOpenInRomfs(const char *file, const char *mode)
     SDL_free(prefixed_filepath);
     return fp;
 }
-
-/* vi: set sts=4 ts=4 sw=4 expandtab: */

src/file/n3ds/SDL_rwopsromfs.h

@@ -26,5 +26,3 @@
 FILE *N3DS_FileOpen(const char *file, const char *mode);
 
 #endif /* SDL_rwopsromfs_h_ */
-
-/* vi: set sts=4 ts=4 sw=4 expandtab: */