Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  9540f0c15da51e3effd5847993bd939d899f1c68

Remove #mw-mf-page-left id

Also, make JS use #mw-mf-page-left instead since that's what contains
the entire left nav now.

Change-Id: Id42763987186b1025ced30c9985cc65b57b12a38