helpers: Make it simple to use glade with PhoshLayerShells

Administratorrequested to merge
simplify-ui-edit into master

Temporarily replace the PhoshLayerShell by a GtkWindow known to glade. We could extend the glade-catalog but this way doesn't require any special setup.

Signed-off-by: Guido Günther guido.gunther@puri.sm

Merge request reports