Patch the vaildation of new users for admin with a security key not used

Only get the last used security key to validate new users

module.py

@@ -782,7 +782,7 @@ def do_validate_signin():
     
     user_id = session[ 'user_id' ]
     
-    q = config.db.query( "SELECT * FROM webauthn WHERE user_id = %s ORDER BY last_usage DESC LIMIT 1", ( user_id, ) )
+    q = config.db.query( "SELECT * FROM webauthn WHERE user_id = %s AND usage_counter > 0 ORDER BY last_usage DESC LIMIT 1", ( user_id, ) )
     key = q.fetchone()
     
     webauthn_user = webauthn.WebAuthnUser(