Make modal based UI changes in TaskView only if modalness changes.

Fixes issue with jittery displaying of suggestion chip, when entering overview.
Merging into master manually as automerger failed.
Tested:Manual

Change-Id: I8228c51b22d550cb8f0aa559f997060b571763f1
(cherry picked from commit ed5e43bd254eb3434a4f5bb20ad07168e6e374d5)
1 file changed