keyboard: Don't clear the keymap when it is set to auto release

Don't unset the keymap when it is set to auto release, or it will infinitely recurse.

src/events/SDL_keymap.c

@@ -207,7 +207,7 @@ void SDL_DestroyKeymap(SDL_Keymap *keymap)
         return;
     }
 
-    if (keymap == SDL_GetCurrentKeymap(true)) {
+    if (!keymap->auto_release && keymap == SDL_GetCurrentKeymap(true)) {
         SDL_SetKeymap(NULL, false);
     }