Unset data-toc in SkinVector

Bug: T302461
Change-Id: I61cf5d3c9016d5997ae56ba18c5eb877e9f68d91

includes/SkinVector.php

@@ -556,6 +556,13 @@ class SkinVector extends SkinMustache {
 		$parentData = $this->decoratePortletsData( parent::getTemplateData() );
 		$featureManager = VectorServices::getFeatureManager();
 
+		// SkinVector sometimes serves new Vector as part of removing the
+		// skin version user preference. TCho avoid T302461 we need to unset it here.
+		// This shouldn't be run on SkinVector22.
+		if ( $this->getSkinName() === 'vector' ) {
+			unset( $parentData['data-toc'] );
+		}
+
 		//
 		// Naming conventions for Mustache parameters.
 		//