Correctly fix name refresh of paintop and SeExpr presets

778e8432 attempts to fix this by forcing
an update of the name widget. This is incorrect, as the underlying preset
instance still has (and will until replaced) the old name. This is easy to
verify by qWarning() both instances' name() after
the resourceSelected call.

The fix here is to:
- apply the changes to the freshly renamed resource,
- and *then* (not before) issuing the resourceSelected call.

CCBUG: 445048
CCMAIL: kimageshop@kde.org
(cherry picked from commit be701342)