[mythtv] first patch :) - mythweb image_cache

[Risto Treksler]

Hi,

my first patch and hopefully thre are more to come
it's just a small change in the way image_cache is cleaned in mythweb

i have alot of shows that are more than a week old
and it was a pain to have the thumbnail images recreated for them every time


risto



ps
i used file_exists instead of  is_file on purpose 
since is_file generated errors on my system for files larger than 2gb
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