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Instead of caching main site id an object cache, store main site id on a network options. This results in less database queries on sites without persistent object caching. Props spacedmonkey, johnjamesjacoby, peterwilsoncc, desrosj. Fixes #55802. git-svn-id: https://develop.svn.wordpress.org/trunk@54256 602fd350-edb4-49c9-b593-d223f7449a82