ecore_drm2: Only use a virtual terminal on seat0
Summary: Only seat0 supports virtual terminals.
Test Plan: Make sure enlightenment does not error out on non-seat0 due to a virtual terminal error. Enlightenment will not start yet on seat1 with this alone
Reviewers: ManMower, devilhorns
Reviewed By: devilhorns
Subscribers: ManMower, devilhorns, cedric, jpeg
Differential Revision: https://phab.enlightenment.org/D5710