Add dconf user config to fix terminal font display

[manics]

I've no idea why but it's been like this for ages:

After this fix

[github-actions[bot]]

:point_left: Launch a binder notebook on this branch for commit 01a47374283c0d0dee7eeb14032ffe437fcb7ab4

I will automatically update this comment whenever this PR is modified

[yuvipanda]

Testing https://github.com/jupyterhub/jupyter-remote-desktop-proxy/pull/86 as an alternative fix

[yuvipanda]

86 fixes it!