Update multimedia/emby-server to latest stable release 3.0.5607.2.

Changes this release:

• Resolved Play To issue with Xbox One that would revert to the default Dlna profile if using a custom device name
• Resolved transcoding failures with Sony Bravia's
• Resolved missing images with Sony Bravia's
• Resolved transcoding failures with Panasonic Viera
• Significantly reduced network footprint when discovering devices on the network
• New DLNA profiles added for VLC and Bubble UPnp, to direct stream all content (subject to bitrate setting)
• Resolved issue of missing header when using the web client on Xbox One
• Resolved incorrect aspect ratio when transcoding anamorphic content with Android TV & Fire TV
• Resolved issue of file handles being left open in Linux when extracting chapter images. This was the primary cause of the Unbutu crashing being reported.
• Resolved issue of backdrop images not being downloaded in certain situations
• Reduced CPU usage caused by dynamically created images

PR: 200160
Submitted by: Ben Woods (maintainer)