Fixed menu scaling issue by disabling the use of GTK popover

[Aleksanaa]

Fixes #9.
Although I don't know why Hyprland displays this abnormally, removing the use of popover in dropdown menu doesn't seem to cause a regression.
Related document:
https://docs.gtk.org/gtk3/method.MenuButton.set_use_popover.html
https://docs.gtk.org/gtk3/method.MenuButton.set_menu_model.html

[Aleksanaa]

Before:

After:

[kRHYME7]

Thanks!

[maxmbed]

Thanks a lot. This fix the issue on my side too.

[charmoniumQ]

Can confirm the issue and that the PR resolves the issue.

Here's a Nix expression which can test it (however, if nixpkgs gets updated, this expression may not work):

(wdisplays.overrideAttrs (attr: {
  patches = (if attr ? patches then attr.patches else []) ++ [(fetchurl {
    url = "https://github.com/artizirk/wdisplays/commit/50e549465d63cdcac1deb385d437a66cb2d08f43.diff";
    hash = "sha256-W9Qk4aX0s+thNy9Slsaz/v2dw+4bLV/OsWH4vhgtXRE=";
  })];
}))