Removed leftover URL in duplicate-slots.js
Removed leftover URL in duplicate-slots.js

No code change, so no copy/rename.

Patch by: Lennard de Rijk
Reviewed by: to-be-reviewed

MatthewWilkes/mw4068-packaging,MatthewWilkes/mw4068-packaging,MatthewWilkes/mw4068-packaging,MatthewWilkes/mw4068-packaging