Merge branch 'fix-shadow-fade' into 'master'

Shadow Fade Fix

Fix Shadows not Fading once they are immune to their summoner's damage

In 083e3474 shadows were updated to not try to fade if they were being hit by their master who they are immune to.  But it was done incorrectly and Shadows of level 5+ lost the ability to fade at all.

See merge request !732