LP#1839341: Fix row duplication and linked field lookup

LP#1839341: Fix row duplication and linked field lookup

The grid needed to be refreshed after a filter change to address
duplicated rows noticed in testing.  In addition, for settings with
typed linked objects, we need to look up the labeling column via the
selector attribute, or use the pkey, rather than assuming a "name"
column will exist.

There is an additional issue with setting typed linked objects in the
Edit dialog, but this is addressed in an enhancement to the core widgets
provided as part of the Simple Reporter work in LP#1945836.

Signed-off-by: Mike Rylander <mrylander@gmail.com>