Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  dd567f8b2707f4ab475dda8c7e2dfbae99379b57

'clearMessage' is a method of MWSaveDialog, not ViewPageTarget

Fixes a small casualty left behind by 972c9a46b7.

Bug: 55726
Change-Id: I8cf8418dede002068fb1090d940b09c3bb91c196