git-commit-template: update ticket url to use pagure.io instead of fedorahosted.org
After the migration to pagure.io, tickets are accessed through another URL.
In order to use the commit template:
git config commit.template .git-commit-template
https://pagure.io/freeipa/issue/6822
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>