Change html dir property when direction changes in demo
Change html dir property when direction changes in demo

The demo direction change should also update the <html> dir
property, especially since some of the direction validation tests check
on their container, which in the case of the demo is the HTML document.

Change-Id: I331e33f1bcbeccca03943832ba0c09c5cd0b5824

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui