Coding Standards: Reorder conditionals in `is_random_header_image()`. #14210

Job	Run time
QUnit Tests	2m 18s
Slack Notifications / Prepare notifications	4s
Slack Notifications / Success notifications	2s
Slack Notifications / Cancelled notifications	0s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Failure notifications	0s
Failed workflow tasks	0s
	2m 24s

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