Small improvement on refactor group resizable panel test #6328

Job	Run time
Check which packages changed	0s
AI bot Tests	41s
Boxel Motion Tests	1m 3s
Lint	2m 20s
Boxel UI Tests	1m 11s
Host Tests	12m 53s
Matrix Client Tests - Group 2	11m 42s
Matrix Client Tests - Group 1	13m 54s
Realm Server Tests	5m 0s
deploy-ai-bot	0s
Deploy boxel to staging	0s
	48m 44s

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