This change removes some overrides that prevented site editor updates in 5.9 from controlling vertical margins via `var(--global--spacing-vertical)`.
Props stacimc, Boniu91, aristath, ironprogrammer, nidhidhandhukiya.
Fixes#54250.
Built from https://develop.svn.wordpress.org/trunk@52726
git-svn-id: http://core.svn.wordpress.org/trunk@52315 1a063a9b-81f0-0310-95a4-ce76da25c4cd