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/joystick/emscripten/SDL_sysjoystick.c

@@ -437,5 +437,3 @@ SDL_JoystickDriver SDL_EMSCRIPTEN_JoystickDriver = {
 };
 
 #endif /* SDL_JOYSTICK_EMSCRIPTEN */
-
-/* vi: set ts=4 sw=4 expandtab: */

src/joystick/emscripten/SDL_sysjoystick_c.h

@@ -47,5 +47,3 @@ typedef struct SDL_joylist_item
 typedef SDL_joylist_item joystick_hwdata;
 
 #endif /* SDL_JOYSTICK_EMSCRIPTEN */
-
-/* vi: set ts=4 sw=4 expandtab: */