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/timer/SDL_timer.c

@@ -600,5 +600,3 @@ void SDL_Delay(Uint32 ms)
 {
     SDL_DelayNS(SDL_MS_TO_NS(ms));
 }
-
-/* vi: set ts=4 sw=4 expandtab: */

src/timer/SDL_timer_c.h

@@ -35,5 +35,3 @@ extern int SDL_TimerInit(void);
 extern void SDL_TimerQuit(void);
 
 #endif /* SDL_timer_c_h_ */
-
-/* vi: set ts=4 sw=4 expandtab: */

src/timer/dummy/SDL_systimer.c

@@ -41,5 +41,3 @@ void SDL_DelayNS(Uint64 ns)
 }
 
 #endif /* SDL_TIMER_DUMMY || SDL_TIMERS_DISABLED */
-
-/* vi: set ts=4 sw=4 expandtab: */

src/timer/haiku/SDL_systimer.c

@@ -43,5 +43,3 @@ void SDL_DelayNS(Uint64 ns)
 }
 
 #endif /* SDL_TIMER_HAIKU */
-
-/* vi: set ts=4 sw=4 expandtab: */

src/timer/n3ds/SDL_systimer.c

@@ -43,5 +43,3 @@ void SDL_DelayNS(Uint64 ns)
 }
 
 #endif /* SDL_TIMER_N3DS */
-
-/* vi: set sts=4 ts=4 sw=4 expandtab: */

src/timer/ngage/SDL_systimer.cpp

@@ -59,5 +59,3 @@ void SDL_DelayNS(Uint64 ns)
 #endif
 
 #endif /* SDL_TIMER_NGAGE */
-
-/* vi: set ts=4 sw=4 expandtab: */

src/timer/unix/SDL_systimer.c

@@ -188,5 +188,3 @@ void SDL_DelayNS(Uint64 ns)
 }
 
 #endif /* SDL_TIMER_UNIX */
-
-/* vi: set ts=4 sw=4 expandtab: */

src/timer/vita/SDL_systimer.c

@@ -51,5 +51,3 @@ void SDL_DelayNS(Uint64 ns)
 }
 
 #endif /* SDL_TIMER_VITA */
-
-/* vi: set ts=4 sw=4 expandtab: */

src/timer/windows/SDL_systimer.c

@@ -91,5 +91,3 @@ void SDL_DelayNS(Uint64 ns)
 }
 
 #endif /* SDL_TIMER_WINDOWS */
-
-/* vi: set ts=4 sw=4 expandtab: */