vm/file-editor: load session environment (#620)
vm/file-editor: load session environment (#620)

Especially set DBUS socket to allow interprocess communication instead of
spawning new instances or timeouts.

woju/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin,QubesOS/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin