Abandoned sign-in leaves UI in unexpected state

[MIchaelMainer]

Describe the bug
Select login, and the login account selection browser window is opened with focus. If you close the login account selection browser window, the

To Reproduce
Steps to reproduce the behavior:

1. Go to Sign into Graph Explorer. The login account selection browser window is opened.
2. Abandon the login by closing the account selection browser window.

Expected behavior
The abandoned login should result in a UI state that doesn't represent an in progress login. We may want to remove the progress indicator as I don't know if there is a way to message back onClose of the login account select browser window..

Screenshots
This image shows the state

https://developer.microsoft.com/en-us/graph/graph-explorer/preview

Desktop (please complete the following information):

• Browser: chrome

[Shjokie]

This has been fixed by #492