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wifi: Avoid critical warning for hotspot dialog

Matthijs Velsink requested to merge velsinki/gnome-control-center:network-fix-critical-hotspot into main

The CcWifiHotspotDialog is derived from GtkDialog, which is floating. The floating reference is destroyed on closing the main window, before the NetDeviceWifi is disposed. This causes a critical warning when the NetDeviceWifi dispose does run, since it tries to destroy a now non-existent window.

Fix this by sinking the floating reference, and unreffing it in the NetDeviceWifi dispose function.

Fixes #2823 (closed)

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