Revert "rbutil: Remove done() signal from Themes Install window."

The done() signal is acutally needed to indicate the installation being
finished. Fixes installation being stuck after themes install.

This reverts commit fb6840e572.

Change-Id: I9c1791e3ecfec992da40ff72b6969d80bbb0cd7f

rbutil/rbutilqt/themesinstallwindow.cpp

@@ -328,6 +328,7 @@ void ThemesInstallWindow::install()
 {
     if(ui.listThemes->selectedItems().size() == 0) {
         logger->addItem(tr("No themes selected, skipping"), LOGINFO);
+        emit done(false);
         return;
     }
     QStringList themes;

rbutil/rbutilqt/themesinstallwindow.h

@@ -45,6 +45,9 @@ class ThemesInstallWindow : public QDialog
     public slots:
         void accept(void);
 
+    signals:
+        void done(bool);
+
     private:
         Ui::ThemeInstallFrm ui;
         HttpGet *getter;