Paste feature does not work if JIRA instance URL configured in Administration contains a slash at the end

Steps to reproduce

1. Install JIRA CKEditor Integration
2. Go to Administer Wiki > Editing > WYSIWYG Editor and paste the following in the Advanced Configuration section: config.extraPlugins = 'xwiki-jira-paste';
3. Go to Administer Wiki > Other > JIRA and add a JIRA instance. For ex:

• Id: JIRA1 (or any other ID)
• JIRA URL: https://jira.xwiki.org/ (with / at the end)

1. Click 'Save'
2. Go to a page and insert a JIRA link, e.g. https://jira.xwiki.org/issues/?jql=issuekey%20in%20(XWIKI-21300%2C%20XWIKI-21310) or https://jira.xwiki.org/browse/XWIKI-23911

Expected results

The pasted JIRA link resulted in inserting automatically the JIRA macro containing the respective tickets.

Actual results

The JIRA link is pasted as a regular link.

The issue does not reproduce if the JIRA instance URL is configured without the slash at the end (e.g. https://jira.xwiki.org)