Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  03b8922b1ffb7308ac763d76695fefd3bee6abb7

Hygiene: Address FIXME in PagePreviewOverlay

Move to more logical place
Do not expose via define when unused.

Change-Id: Icf833e6487238dfb5fcc87774890a0ed5dcd7e82