gitRemoteSetOriginAction: Use regex capture group

Finally figured out how to get a capture group out of the regex match.
Needed to coerce as a two-dimensional `String` list.

Thanks to:
- https://stackoverflow.com/questions/24699279/cant-capture-a-group-in-a-string
- https://stackoverflow.com/questions/6729158/find-all-capturing-groups-of-a-regular-expression

Get the captured group and set it to the URL to insert into the
database. It lives in the second element of the first list:

    Prelude Text.Regex.TDFA> "git remote set origin https://example.new" =~ "^git remote set origin ([^ ]+)$" :: [[String]]
    [["git remote set origin https://example.new","https://example.new"]]
    Prelude Text.Regex.TDFA> "" =~ "^git remote set origin ([^ ]+)$" :: [[String]]
    []

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