Hygiene: Cleanup mw-ui-icon specific code

* The watchstar icons in search should use a standard icon size
* Limit rules in page actions to the icons that have issues.
* Purposely misalign icons (see bug 73391)

Change-Id: I7356e832b1d160769ce965cfab20bae05696642f
Merge "Hygiene: Cleanup mw-ui-icon specific code"