Bug 2004889: hack to make beam.fr_count negative if the player answered

"no" to a "really fire beam" prompt; this allows fr_count to be used to also actaully count how many friends would be hit when firing a player tracer, instead of only indicating if a beam was canceled.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6179 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on June 28, 2008
2CEV66TXUER5NK3NRZAQGWL7X5ES6LPMOSSO4RU25LPJIUC3XGSQC
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