ve.init.mw.ViewPageTarget: Hide #contentSub in addition to #toc when muted

Yet a another visual shift eliminated. Getting closer..

Bug: 64751
Change-Id: I9ae7afc439648e62712f6dedb7cecc07a653675a
Merge "ve.init.mw.ViewPageTarget: Hide #contentSub in addition to #toc when muted"