multimedia/emby-server: Update to 3.0.5641.5, fix distinfo

The upstream project on GitHub was renamed from MediaBrowser to Emby
causing the following error:

size mismatch: expected 54577043, actual 54582083

• Update to 3.0.5641.5
• Change the upstream repository name to compensate

PR: 201369
Submitted by: Ben Woods <woodsb02 gmail com> (maintainer)
MFH: 2015Q3