RFR: git-pr: use correct argument in git-pr issue

[Erik Helin]

On Wed, 8 Jul 2020 13:42:52 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> Hi all,
>> 
>> please review this small patch that fixes `git pr issue --remove` to use the correct argument (`--remove`, not `--add`).
>> 
>> Testing:
>> - Manual testing on Linux x64
>> 
>> Thanks,
>> Erik
>
> Marked as reviewed by jvernee (Reviewer).

Thanks @JornVernee for reviewing! ��

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PR: https://git.openjdk.java.net/skara/pull/696