Add wayland support for entry

[worldofpeace]

Currently segfaults in GNOME3 Wayland like

invalid cast from 'GdkWaylandDisplay' to 'GdkX11Display'

[cassidyjames]

Considering this is built specifically for elementary OS which is explicitly X11 and not Wayland, fixing this is a lower priority. Pointers or PRs welcome, though.

[worldofpeace]

built specifically for elementary OS which is explicitly X11 and not Wayland, fixing this is a lower priority

Understood, but future proofing 😄