Fix: [SDL] remove hint to avoid hardware acceleration (OpenTTD#11790)

This hint was once needed because of the way we handled surfaces.
But as OpenGL already uses a hardware surface, we already had to
fix all the issues that comes with it. As that is generic code,
this hint is no longer actually needed. Further more, recent SDL
versions break because of it on Wayland.

src/video/sdl2_v.cpp

@@ -507,11 +507,6 @@ bool VideoDriver_SDL_Base::PollEvent()
 
 static const char *InitializeSDL()
 {
-	/* Explicitly disable hardware acceleration. Enabling this causes
-	 * UpdateWindowSurface() to update the window's texture instead of
-	 * its surface. */
-	SDL_SetHint(SDL_HINT_FRAMEBUFFER_ACCELERATION, "0");
-
 	/* Check if the video-driver is already initialized. */
 	if (SDL_WasInit(SDL_INIT_VIDEO) != 0) return nullptr;