geometry shape changes also with no resize

Summary:
the morphingpopup effect was working with notifications only
in wayland. looking at what the codepath is, the signal
geometryShapeChanged was not emitted as it was checking for
resized, but it's supposed to come at every geometry
update, not only resizes

Test Plan:
notification with D6216 are correctly animated, other
animated things liketooltips are unaffected

Reviewers: Plasma, KWin, graesslin, davidedmundson

Reviewed By: Plasma, davidedmundson

Subscribers: plasma-devel, kwin

Tags: KWin

Differential Revision: https://phabricator.kde.org/D6229