fix fallback overwriting result of getHome

lib/private/user/user.php

@@ -141,9 +141,10 @@ class User {
 		if (!$this->home) {
 			if ($this->backend->implementsActions(\OC_USER_BACKEND_GET_HOME) and $home = $this->backend->getHome($this->uid)) {
 				$this->home = $home;
-			}
+			} else {
 				$this->home = \OC_Config::getValue("datadirectory", \OC::$SERVERROOT . "/data") . '/' . $this->uid; //TODO switch to Config object once implemented
 			}
+		}
 		return $this->home;
 	}