Wrong window type for ad-hoc credentials pop-up

[WhyNotHugo]

The pop-up requesting SSID and password doesn't seem to properly configured as a pop-up.

As a result, tiling window managers treat it as a "regular" window, and tile it, growing it into a huge portion of the screen.

Reproduction step

• Switch to Mode: Ad-hoc
• Click Start node

The resulting pop-up is rendered as a top-level window, and tiling window managers treat it as such, tiling it alonside the main window rather than showing it as a floating pop-up window.

I can reproduce this on swaywm (It can run nested under another compositor for testing something like this).