Set $wgULSNoWebfontsSelectors

$wgULSNoWebfontsSelectors had default value as '#p-lang li > a'
-the interlanguage links. It does not make sense after the class
'autonym' was added to such links. That 'autonym' css class has
fontfamily definition as Autonym, sans-serif. More info on I7478a58.

This is a configuration update that does the same thing as
https://gerrit.wikimedia.org/r/#/c/100971 without the need for a
lightning deployment window.

This can be reverted once 1.23wmf7 has been deployed on all Wikimedia
wikis.

Bug: 58374
Change-Id: Ib597431a3176abda6ab438976fefb6377ecf4ab9