notedeck : Switch to egui master to fix wgpu issues

There are some wgpu issues that are fixed in egui-master, so

let's switch to that.

This fixes notedeck so that it runs on both my intel graphics laptop

and amdgpu desktop.

Fixes: https://github.com/damus-io/notedeck/issues/28

Fixes: https://github.com/damus-io/notedeck/issues/42

Fixes: https://github.com/damus-io/notedeck/issues/141

Signed-off-by: William Casarin

https://github.com/damus-io/notedeck/commit/239a2cb701d1f3692d1e10769de7c86bf40a5f56