applets/notifications: Allow notification popups to expand in width if its contents don't fit
This changes notification popups to treat Globals.popupWidth as a minimum width rather than a fixed width, allowing the popup's contents to expand the width if the contents won't properly fit. This mainly affects popups with actions, including the Job action.
If the popup would get so large that it no longer would fit on the screen, the action buttons are shrunk instead.
Screenshots:
| Normal Popup |  |
| Popup with Large Actions |  |
| Too large for screen |  |
| Job Popup with large actions |  |
Edited by Arjen Hiemstra