Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  2c8912903596e8a638d9c7dc983b34cf9f046cb3

Removed unnecessary step

All tests pass without this step. Looks like beta mode is no longer
required.

Change-Id: Idc9ad1bc68744a9d09e39de3f58351446f5caac2