Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  e0dceba7b5adf9e07cacb3b8157aefcf49ef595c

Fix position fixed handling is iOS <= 4_2

Seems to need to account for the height of the address bar
and the open keyboard

Cleanup user agent testing in process
Bug: 53048

Change-Id: I841ca5c6925ff189bd7a9b24e04d645d491dbf1f