When files have an opaque origin, the "file" scheme is omitted from the
blob URL serialization in the stack trace.
This change normalizes the output in the test so that both tuple
file origins and opaque file origins (which may serialize as
'blob:ladybird/') is accepted, ensuring the test passes in
both scenarios.
Atlassian login gets the base URL for its module scripts by throwing an
error and pulling out the current script's URL from error.stack with
regex.
Since we only returned a basename for module scripts, it would fail to
match and try and use `/` as a base URL (because it does
[matched_string] + "/"), which is not a valid base URL.
