Reverts [56451] to avoid the following issues:
* missing the default `font-size` for anyone who does not use the size control.
* unintentional reduction in citation's `line-height` down to the `--pullquote--line-height` value (1.3 instead of 1.6).
With 6.4 RC1 happening shortly, this revert is necessary to avoid shipping this issues in the release, while giving the time needed to resolve in the next cycle.
Follow-up to [56451].
Props sabernhardt, nicolefurlan.
See #57854.
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