Append a trailing slash to Bugzilla URL

Summary:
Script is directly appended to URL, so this fixes incomplete URLs
like like https://bugzilla.espace-win.orgshow_bug.cgi?id=19

This is a follow-up for f95a5134a128.

Test Plan:
https://bugzilla.espace-win.org/ > quick search > enter "19"

It now redirects correctly to https://bugzilla.espace-win.org/show_bug.cgi?id=19

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D1862