Media Library Search should include filename / guid

[MadtownLems]

Searching the media library should also return results that match the actual filename / guid of the uploaded file.

A user just came to me with a file URL on their site, and wanted help finding it in their media library:
​http://mysite.com/files/2010/10/20124.pdf

I'd expect that searching for 20124.pdf would return it, but it does not.

[SergeyBiryukov]

Duplicate of #22744.