librem5.gschema.override: Update Epiphany user agent
Remove Android from it and adjust it to be more Safari-like.
In particular, YouTube plays videos via RTSP when Android is present in UA, and WebKitGTK doesn't support it. When Android is not present, it instead shows a version using a regular HTML5 video.
@sebastian.krzyszkowiak mentioned Twitter using an old version, but it still works as long as Chrome is in the UA. Any other problematic websites?
Fixes Apps_Issues#170 (closed)
Edited by Alice Mikhaylenko