use the whole hostname to check remote links - fixes #866

What does this MR do?

the warning dialog's "trust this domain" toggle saves the whole hostname, so this code needs to use the whole hostname

otherwise trusting a www.example.com will never work, because we'd be checking example.com against it, and fail

while I was there, I also made the trustedLinkUrlPatterns correctly match sub-domains: previously, trusting ple.com would trust example.com

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requested review from @CenTdemeern1, @Marie, @luna, and @tess

approved this merge request

approved this merge request

mentioned in commit 5faa26b0

merged