Updated mediawiki/extensions
Project: mediawiki/extensions/CirrusSearch  82762423ba3c92028f3e007f9ecda6d500f475c3

Use actual percentage difference formula

The old formula prodcued numbers that were similar to but almost
entirely unlike percent difference.

Change-Id: Ibb4a4df9e17b7f10529ee1068b35f0461c5234d5