Remove the check for can_safely_mutate() in Zin's mutation removal

retribution, since it'll work regardless.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4659 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on April 26, 2008
7MAKUMLJJXOZTCT2BBGKWJXJONLUYQLPMZMDKSCZRT4Y3444SAAQC
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