[AppDB] - fix appimage.php

[Chris Morgan]

appimage was calling stat() on files composed like: "data/screenshots/'.
$aClean['iId'] where iId is the image id.  When we first had screenshots we 
used the filename that the user provided as the actual name of the file on 
disk.  Later on we switched such that each file is named after its image id.  
Use the image url field in place of the image id so we can continue to stat() 
the hundreds of files that don't use the current numbering scheme and so we 
are more flexible in the future if we decide to move or remap images by 
modifying their url.

Chris

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