Post: Remove unused variable `$hidden_inputs` #33691

Job	Run time
Determine Matrix	4s
Single Site Memcached / Test current	13m 20s
Single Site Memcached / Test before	13m 11s
Multisite Default / Test current	13m 0s
Multisite Memcached / Test before	13m 35s
Multisite Default / Test before	13m 39s
Multisite Memcached / Test current	13m 25s
Single Site Default / Test current	12m 59s
Single Site Default / Test before	14m 22s
Slack Notifications	0s
Compare / Multisite Default	13s
Compare / Single Site Memcached	15s
Compare / Multisite Memcached	18s
Compare / Single Site Default	18s
Failed workflow tasks	0s
	1h 48m 39s

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