Fix `/add relnote` from `mingw-w64-gnutls: update to version <...>` PRs

[dscho]

In https://github.com/git-for-windows/MINGW-packages/pull/98#issuecomment-1826164393, I tried to add a release note but it failed with "Could not determine URL from issue 98".

Full web request

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"MDIzOkludGVncmF0aW9uSW5zdGFsbGF0aW9uMzE1NDQ3MzE=" } } ```

When I tried the same from https://github.com/git-for-windows/MSYS2-packages/pull/134#issuecomment-1826164511, however, it worked.

My guess is that the mingw-w64- prefix trips up GitForWindowsHelper.