Moved ankh prop picture from Liberty image dir to core images dir

(at /data/core/images/items). Shadow updated by Shadow Master. Removed
from Liberty to avoid duplication.

data/campaigns/Liberty/scenarios/utils/utils.cfg

@@ -85,7 +85,7 @@
         [object]
             id={ID}
             name= _ "Holy Ankh"
-            image=props/ankh.png
+            image=items/ankh-necklace.png
             duration=level
             description= _ "You find a hefty pendant on a strange and ominous looking altar. It glows brightly when you pick it up!"
             cannot_use_message= _ "There is a strange altar here and a pendant on it. I don't want to touch it."