Remove obsolete switch

Author: jonathonherbert

dotcom-rendering/scripts/perf/k6/article-nier-automata.json

@@ -1590,7 +1590,6 @@
 			"enableDiscussionSwitch": true,
 			"prebidXaxis": true,
 			"stickyVideos": true,
-			"interactiveFullHeaderSwitch": true,
 			"discussionAllPageSize": true,
 			"prebidUserSync": true,
 			"audioOnwardJourneySwitch": true,