Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  15d870f49a9c2b7dd3b89b4523e42010cd2573c1

Hygiene: Componentise interactive.less

Split into multiple files.
This will allow us to organise the css better and make it easier to
only load the minimum required for mobile.

Change-Id: I50d7ac887f16f536ab0616969b26fa6a24145ded