Fix the ASSERT when undetected traps run out of ammo and display "You

hear a click" instead of "The trap is out of ammo". Also, fix the miscolouring of the lua eating prompt.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7428 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on November 9, 2008
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