RemoteDialog: Fix button states after adding remote

As adding a remote leads to a model reset which does not
trigger the selectionChanged signal, all buttons were
enabled despite no remote was selected.

Change-Id: I2f752fcf5f1830728d1bcf9810ca4648bd2f287b
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/git/remotedialog.cpp

@@ -145,6 +145,8 @@ RemoteDialog::RemoteDialog(QWidget *parent) :
 
     connect(m_ui->remoteView->selectionModel(), &QItemSelectionModel::selectionChanged,
             this, &RemoteDialog::updateButtonState);
+    connect(m_remoteModel, &RemoteModel::refreshed,
+            this, &RemoteDialog::updateButtonState);
 
     updateButtonState();
 }