X.U.EZConfig: Fix checkKeymap warning that all keybindings are duplicate

[ulrikdem]

Description

This reverts part of 42179b8625d83b2cd3c3a35da84de6f6c0dea6d6, which effectively changed the duplicate check from >1 to >=1.

Checklist

• [x] I've read CONTRIBUTING.md

• [ ] I've considered how to best test these changes (property, unit, manually, ...) and concluded: XXX

• [x] I updated the CHANGES.md file

[slotThe]

Whops—and thanks!