GH-988 add ability to toggle mods with keyboard

application/pages/instance/ModFolderPage.h

@@ -94,6 +94,7 @@ slots:
 
 private
 slots:
+    void modItemActivated(const QModelIndex &index);
     void on_filterTextChanged(const QString & newContents);
     void on_RunningState_changed(bool running);
     void on_actionAdd_triggered();