Use middle-click or ctrl+left-click on script menuitem to open script options dialog

You can right-click on script menuitem in Monkey Menu to edit user script, but to open script options dialog (to add/edit/remove include/exclude), you have to do it from Add-on Manager.

This patch adds ability to open user script options dialog by middle-clicking or ctrl(cmd key on Mac)+left-clicking on script menuitem from Monkey Menu.