Updated mediawiki/extensions
Project: mediawiki/extensions/Configure  6242f6948f2811d2e4038e69576cb5b4904393fd
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Remove everything related to nonexistent $wgExcludeFromThumbnailPurge

It has no documentation page on MediaWiki wiki and doesn't grep in MediaWiki core.

Change-Id: I971ea7ad9b0d0518927edd4a082696a29a75ee74