Prevent adding routes in read-only sessions

"AddTrackBus" is a rec_sensitive and write_sensitive action.

However the mixer bypasses this and unconditionally calls
ARDOUR_UI::instance()->add_route () in various cases
(right-click on blank space or scroller, left-click on "Add" buttons
in the VCA pane, route pane, etc).

Since those are direct events, not related actions, they need
to be explicitly ignored.

Ideally the "+" buttons would be made insensitive...

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