Polish Notifier Plasmoid's UI
Summary:
This patch implements the following changes to Discover's Update Notifier plasmoid:
- Improve the layout of the controls within the window
- Update the button text to reflect what it will actually do (the previous text was misleading since it did not in fact perform the updates; it just opened Discover)
- Update the tooltip text to be clearer
- Give the button an icon to match its plasmoid icon
Test Plan:
Before:
After:
Reviewers: apol, Discover Software Store, VDG
Reviewed By: apol, Discover Software Store
Subscribers: fabianr, esedgh, broulik, abetts, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D14238