fix bug with image attatchment settings

I've been having some problems getting my New York Times feed to show the attached images inline.

This is in part because the feed has inline "<img" tags for both tracking images and ads, but frequently has the actual image as a attachment.

To work around this I enabled "Always display image attachments" however the related variable ($always_display_enclosures) didn't seem to get set in the rendering logic.

Attached is the patch at present.. if its missing something I'm all ears (still exploring the codebase)