Starting `wdisplays` on a NixOS 20.09 with `sway-1.5` breaks with the
following output:
```
(wdisplays:28400): Gtk-WARNING **: 10:26:38.619: Could not load a pixbuf from /org/gtk/libgtk/theme/Adwaita/assets/bullet-symbolic.svg.
This may indicate that pixbuf loaders or the mime database could not be found.
Gdk-Message: 10:26:38.752: Error reading events from display: Success
```
The first two warnings can be fixed by adding `wrapGAppsHook`. The last
error is an upstream bug that can be fixed by applying the patch from a
pending PR[1].
[1] https://github.com/cyclopsian/wdisplays/pull/20
