Add "Download" feature to Android version

[RafaelLinux]

Hello
As it's not an issue, but a feature request, I put it here. Please, add "Download" option to "MediaBrowser" tab list in Android version, as in desktop one.

Thank you

[zaps166]

Android version already have it, but it was missing tap-and-hold for popup menu. Now it should be possible!

[RafaelLinux]

Thanks !!