Bug fix for searchFileCollection

Running railo 4 on windows, after a reindex file urls returned by
lucene were changing from /<fileID>.<fileExt> to \<fileID>.<fileExt>
which was causing the searchFileCollection method to parse out
incorrect fileIDs which was hiding files from the search results.
I've updated searchFileCollection() to parse out the correct fileID
now and I'm seeing files appearing in my search results correctly.