Remove redundancy: if a monster resists hellfire, it also resists normal

fire.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8362 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 9, 2009
7EANCJYMLJ2OTXHETBPPI2XTD2UGXICPJXRLGF6JJXWVBDPW6KVAC
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