wifi: Add padding to Known Wi-Fi Networks dialog
The "Known Wi-Fi Networks" dialog is missing some padding to really make it look polished.
By switching from a normal dialog to an AdwPreferencesWindow, we can take advantage of libadwaita's automatic padding. This will make sure the dialog is more in line with the rest of the GNOME ecosystem.
Closes #1956 (closed)
Edited by Hendrik Müller