BUG #13811.  3D widget visibility issues.

This builds on fix in bc7cf27e. We were still missing select/deselect calls
when the 3D widget was created in a legacy panel or as part of the
pqProxyPropertyWidget. This patch address that issue.

Change-Id: I3af25e4bf837eaef1e73470c576e3e304f9a4bfb
Merge topic '13811_fix_3d_widget_visibility' into next

2637a01 BUG #13811.  3D widget visibility issues.