wayland: Also support the v2 of the importer
Commit 0ba8e16e added support for the export part of zxdg_foreign_v2, but neglected that the importer has a v2 as well. Support it.
Commit 0ba8e16e added support for the export part of zxdg_foreign_v2, but neglected that the importer has a v2 as well. Support it.