Remove SDL_HINT_IDLE_TIMER_DISABLED.

SDL_DisableScreenSaver can be used instead. Fixes #6660.

test/testautomation_hints.c

@@ -12,7 +12,6 @@ const char* _HintsEnum[] =
     SDL_HINT_FRAMEBUFFER_ACCELERATION,
     SDL_HINT_GAMECONTROLLERCONFIG,
     SDL_HINT_GRAB_KEYBOARD,
-    SDL_HINT_IDLE_TIMER_DISABLED,
     SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS,
     SDL_HINT_MAC_CTRL_CLICK_EMULATE_RIGHT_CLICK,
     SDL_HINT_MOUSE_RELATIVE_MODE_WARP,
@@ -38,7 +37,6 @@ const char* _HintsVerbose[] =
     "SDL_FRAMEBUFFER_ACCELERATION",
     "SDL_GAMECONTROLLERCONFIG",
     "SDL_GRAB_KEYBOARD",
-    "SDL_IDLE_TIMER_DISABLED",
     "SDL_JOYSTICK_ALLOW_BACKGROUND_EVENTS",
     "SDL_MAC_CTRL_CLICK_EMULATE_RIGHT_CLICK",
     "SDL_MOUSE_RELATIVE_MODE_WARP",