Revert "LaTeX commands: Avoid superfluous and fatal cast to Gtk.Activatable"
This reverts commit 02f35b9d. I've discovered more crashes when gnome-latex is compiled with valac git master (what will become vala 0.42). I don't plan to work on gnome-latex anytime soon, so in the meantime gnome-latex will need to be compiled with vala 0.40. With this revert the nice thing is that gnome-latex cannot be compiled with vala git master, but can be compiled with vala 0.40.
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