Fixed Twenty Twenty: `Separator block (dots)` does not render anymore

[umeshsinghin]

Trac ticket: https://core.trac.wordpress.org/ticket/61787

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Props umeshsinghin, narenin.

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[narenin]

@umesh-uiux The patch looks fine but please add this CSS also to vertically center align the dots.

.wp-block-separator.is-style-dots {
	height: auto;
}

[narenin]

@umesh-uiux The patch is working fine.