Some more bugfixes for the tag
- Don't crash when updating the toolbar icons
- deprecated--
- Replace some tabs with spaces
- In the toolbar and the quick search combobox, show the tag name without any prefixes because of the lack of space there
- Actually load the tag actions when KMail starts up
- Fix the toggled state of the actions, it was not updated properly- Preselect the action category when choosing a tag icon