Popup does not use configured settings

[psrpinto]

Currently there's an issue that causes the popup to ignore configured settings (e.g. default homeserver), i.e. properties set up through Settings -> Chatrix are ignored.

[psrpinto]

Reported by @julianfoad at https://wordpress.org/support/topic/a-great-start-for-such-an-early-version-0-4-0