fix #413: add user-agent check for memories mobile app

lib/AppInfo/Application.php

@@ -106,6 +106,10 @@ class Application extends App implements IBootstrap
 
     protected function isEnabled(): bool
     {
+        if (preg_match('/MemoriesNative/', $_SERVER['HTTP_USER_AGENT'])) {
+            return false;
+        }
+
         $enabled = true;
         $isForced = (bool) $this->config->getAppValue(self::APP_ID, 'force', '0');