Fixed note deletion when Del is hit in the search box or Notebooks pane
Fixed note deletion when Del is hit in the search box or Notebooks pane

Also fixed regression introduced by one of the earlier proposed
solutions ("Delete" context menu item is always grayed out), that was
checked in as 7274ebd68216e7956b84804f61de22e0809e59d0.

Signed-off-by: Jared Jennings <420d97235124da5bf24c51a35edb1119f653ce09@jaredjennings.org>

rotty3000/tomboy,rotty3000/tomboy,tomboy-notes/tomboy,tomboy-notes/tomboy,tomboy-notes/tomboy,rotty3000/tomboy,rotty3000/tomboy,tomboy-notes/tomboy,tomboy-notes/tomboy,rotty3000/tomboy