[bp] Handle logged in RedirectPage

We returned a false browserunavailable in some pro accounts. Here
we add a check on the redirect page.

Closes: 56215@sibi, 17824@zendesk, 17830@zendesk, 17844@zendesk, 17854@zendesk, 17858@zendesk, 17863@zendesk, 17868@zendesk, 17871@zendesk, 17905@zendesk, 17923@zendesk, 16614@zendesk, 17943@zendesk, 17957@zendesk, 17966@zendesk, 17971@zendesk