pqSMTKNewResourceBehavior: clean up observer upon deletion.

Status Job ID Name Coverage
  External
passed cdash

passed ghostflow-branch-check-master

failed smtk@master-kerbin-windows-shared-release+examples+remus

00:07:34

failed smtk@master-moho-linux-shared-relwithdebinfo+examples+private+remus

00:09:43

failed smtk@master-moho-linux-shared-relwithdebinfo+examples+python3+remus+vtk

00:00:03

failed smtk@master-moho-linux-shared-relwithdebinfo+examples+remus

00:09:47

failed smtk@master-moho-linux-shared-relwithdebinfo+examples+remus+vtk

00:08:25

passed smtk@master-norkit-osx-shared-release+examples+matplotlib

00:19:18

running smtk@master-praxis-windows-shared-release

1996:43:28

failed smtk@master-talosiv-osx-shared-release+examples+matplotlib

00:15:13

failed smtk@master-tatooine-osx-shared-release+examples+matplotlib

00:08:34

failed smtk@master-tatooine-osx-shared-release+examples+matplotlib+private

00:08:58

passed cdash