Git: Enable commit selection in Push to Gerrit dialog

Change-Id: Ie0ca8322858ac75d4bacf8b3efe66fa40577e3a2
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

src/plugins/git/logchangedialog.cpp

@@ -132,6 +132,7 @@ bool LogChangeWidget::populateLog(const QString &repository, const QString &comm
             m_model->appendRow(row);
         }
     }
+    setCurrentIndex(m_model->index(0, 0));
     return true;
 }