Updated mediawiki/extensions
Project: mediawiki/extensions/DonationInterface  8be80ec58a1c0b56e7d9e4d086d3e627b1994984

Rename GatewayForm to GatewayPage to distinguish from Gateway_Form

Changes the name of the GatewayForm that extends UnlistedSpecialPage,
since Gateway_Form really is specialized to render forms

Change-Id: I4552f3259ae0f2d7a35a946887e0d44ff186041f