fix issue where inviteUser rejects

[trevj]

Fixes an issue by which inviteUser rejects unless the cloud instance has been added since last login.

Basically, we should check this.savedContacts_ for the presence of an invite with an ADMIN username and then reconnect. Oops, thanks for spotting!

[lucyhe]

This is almost working as expected in my testing!
The situation I'm encountering:
Upon login, inviteUser is called to get an inviteUrl, but still exits early because it cant find the clientId in savedContacts. However, if I start proxying and then refresh the UI, inviteUser will work. (sendMessage calls reconnect_, and the correct entry is added to savedContacts.)

[trevj]

OK, I think inviteUser probably shouldn't be called at login -- let's chat later :-)

[trevj]

I've just been testing this with your pull request and inviting seems to work now, even if I haven't added the cloud instance since logging into cloud.

[lucyhe]

awesome, sounds good! 👍