librem5.gschema.override: Disable hardware acceleration in Epiphany
It doesn't work right now and causes broken display. Old versions of Epiphany didn't even try to use acceleration, but the one that just went into amber-phone-staging actually tries and ends up with just garbage on the screen.
Also, remove mobile-user-agent from Epiphany overrides to fix a warning:
No such key “mobile-user-agent” in schema “org.gnome.Epiphany.web” as specified in override file “/usr/share/glib-2.0/schemas/11_librem5.gschema.override”; ignoring override for this key.
Edited by Sebastian Krzyszkowiak