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Fix overlay headings

Description

Fix overlay headings

I0b7fc8b5 introduced a styling regression wherein overlay headings had
the article heading's font-family rule applied.

Reinstate the .pre-content and .content scope for the rules in
skins.minerva.content.styles/headings.less.

Bug: T93826
Change-Id: I923d8ee6e42de0916e9a294835846fd4e6ca7825