Disable GameInput for mouse and keyboard by default

We're going to wait for this to get more testing before enabling it by default.

Fixes https://github.com/libsdl-org/SDL/issues/13846

src/video/windows/SDL_windowsvideo.c

@@ -603,7 +603,7 @@ static bool WIN_VideoInit(SDL_VideoDevice *_this)
     SDL_Log("DPI awareness: %s", WIN_GetDPIAwareness(_this));
 #endif
 
-    if (SDL_GetHintBoolean(SDL_HINT_WINDOWS_GAMEINPUT, true)) {
+    if (SDL_GetHintBoolean(SDL_HINT_WINDOWS_GAMEINPUT, false)) {
         WIN_InitGameInput(_this);
     }