Updated mediawiki/extensions
Project: mediawiki/extensions/Echo  d2702cb1e9acde17b0ed2d68a8539e7d4bdf9407

Adding explicit prefix so we don't have to have an exception in prefs

If we add an explicit prefix (similar to what the Gadgets extension
does), we won't have to have a special handler for checkmatrix options
in Preferences::filterDataForSubmit().

Depends on core change I4049b666

Change-Id: Ic8420b896bc013840eb3a32420a49f6719f30610