Gerrit: Use short user name for marking owned changes

Gerrit provides this data. There's no reason to wait for the query's
result to determine who I am.

Change-Id: Icd0f08fd08cf428dfbadf88224ae21bd4dbc207f
Reviewed-by: André Hartmann <aha_1980@gmx.de>

src/plugins/git/gerrit/gerritmodel.h

@@ -77,6 +77,7 @@ public:
     int neededByNumber = 0;
     QString title;
     QString owner;
+    QString user;
     QString email;
     QString project;
     QString branch;
@@ -142,7 +143,6 @@ private:
     QSharedPointer<GerritServer> m_server;
     QueryContext *m_query = 0;
     QueryState m_state = Idle;
-    QString m_userName;
 };
 
 } // namespace Internal