update appMenu status only from qml side
Summary:
--add NeedsAttention status when a menu is showing, and
Passive status when the menu is not available
--remove status updates from plasmoid interface
Test Plan:
I used debug messages to confirm the status changes and
also Latte to check that dynamic background now works ok
Reviewers: Plasma, broulik
Reviewed By: Plasma, broulik
Subscribers: broulik, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D10710