Don't check SDL_RENDER_DRIVER in automated tests

This might be set in the environment for testing purposes

test/testautomation_hints.c

@@ -14,7 +14,6 @@ static const char *HintsEnum[] = {
     SDL_HINT_MOUSE_RELATIVE_MODE_WARP,
     SDL_HINT_ORIENTATIONS,
     SDL_HINT_RENDER_DIRECT3D_THREADSAFE,
-    SDL_HINT_RENDER_DRIVER,
     SDL_HINT_RENDER_VSYNC,
     SDL_HINT_TIMER_RESOLUTION,
     SDL_HINT_VIDEO_ALLOW_SCREENSAVER,
@@ -32,7 +31,6 @@ static const char *HintsVerbose[] = {
     "SDL_MOUSE_RELATIVE_MODE_WARP",
     "SDL_ORIENTATIONS",
     "SDL_RENDER_DIRECT3D_THREADSAFE",
-    "SDL_RENDER_DRIVER",
     "SDL_RENDER_VSYNC",
     "SDL_TIMER_RESOLUTION",
     "SDL_VIDEO_ALLOW_SCREENSAVER",