[Tracker] [BUG] can't search for filenames starting with numbers

[Luca Ferretti <elle uca libero it>]

Description
        It seems that tracker-search is not able to find any file with a
        filename pattern [0-9]*
        
How to Reproduce
        1. Run in terminal `echo "this is a test" > 3test.txt`
        2. Wait trackerd indexing this new file
        3. Run `tracker-search 3test`
        
Expected Results
        tracker-search should list the new file as match
        
Current Results
        no matches
        
Additional Info
        Tried with tracker 0.5.2 deb packages, not with latest cvs code.