fix finding of groups with decodable chars in their id via DAV

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

apps/dav/lib/DAV/GroupPrincipalBackend.php

@@ -219,7 +219,7 @@ public function searchPrincipals($prefixPath, array $searchProperties, $test = '
 							}
 						}
 
-						$carry[] = self::PRINCIPAL_PREFIX . '/' . $gid;
+						$carry[] = self::PRINCIPAL_PREFIX . '/' . urlencode($gid);
 						return $carry;
 					}, []);
 					break;