Authenticated Onion Services do not prompt for auth key in 12.0 alpha series

@ma1 and I did a little digging into this. The immediate cause for this is in nsDocShell.cpp: the failedChannel pointer is null in nsDocShell::CreateContentViewer(). Beyond that I have no idea. The nsDocShell::DisplayLoadError() method seems to be doing the right thing. vOv

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