Classic Editor: reduce height of slug editing field #29375

Job	Run time
Core running from build / Linux	2m 19s
Core running from build / MacOS	2m 57s
Core running from src / Windows	3m 26s
Core running from src / Linux	2m 18s
Core running from build / Windows	3m 32s
Core running from src / MacOS	2m 7s
Slack Notifications	0s
Failed workflow tasks	0s
	16m 39s

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