[imp] Disable bottom thumbnail in IMP WebMail

[Josep Cols]

Hello:

They're a way to disable the bottom thumbnail on IMP?. And only the PDFs?
For PDF's, the thumbnail is generated by ghostscript and ghostscript has 
a lot of bugs that invalidates the page and impede the download of PDF 
messages.
When a PDF thumbnail is generated, the followin error is listed on http 
error_log file: GPL Ghostscript 8.71: Unrecoverable error, exit code 1

For clarification, I attach an image with the bottom message I would 
like to disable.

Thanks
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