Don't pass the AppHooks as pointer

It's not permitted to pass a nullptr to the `app_hooks_update`. So a
reference should be used.

CppCheck says one shouldn't take pointer to a temporary.

source/ps/GameSetup/GameSetup.cpp

@@ -208,12 +208,11 @@ void InitVfs(const CmdLineArgs& args)
 	psSetLogDir(logs);
 	// desired location for crashlog is now known. update AppHooks ASAP
 	// (particularly before the following error-prone operations):
-	AppHooks hooks{
+	app_hooks_update({
 		.get_log_dir = psLogDir,
 		.bundle_logs = psBundleLogs,
 		.display_error = psDisplayError
-	};
-	app_hooks_update(&hooks);
+	});
 
 	g_VFS = CreateVfs();