Special:OpenIDDashboard still using wgOpenIDClientAndProviderMode
Bug: 50712

$wgOpenIDClientOnly was used until version 3.11, then changed to
$wgOpenIDConsumerAndAlsoProvider.

Change-Id: Idbb74e27e3dfc20b554b940be1dfcb1079701c33
Special:OpenIDDashboard was still using $wgOpenIDClientOnly.