Fix friendly fire among monsters by restricting the tracer check I added

for the ally prompts to player bolts.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10547 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on August 14, 2009
EJM4KGCEPHK7NVOZDWXJTECUCWFFTNSB5VYQS2HECLD3LPFXS4JAC
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