Alien Icon Fixed and revamped
Fixed icons not disappearing on embryo removal

Basically for whatever reason I did not see affected mob was a variable
and instead used loc for determining the mob affected by the embryo
Changed it to use affected mob, which actually should fix a lot of
fringe cases where the icon would not remove the correct icon
Merge pull request #4307 from Zelacks/alienimagefix

Fix for Alien Infection Image