Dont strip non-marker meta nodes even if they have a marker typeof.

* Sometimes a non-tpl meta node might get the mw:Object/Template typeof
  element attached to it. So, check the property to make sure it is not
  of those metas before deleting it.

  Ex: {{compactTOC8|side=yes|seealso=yes}} generates a mw:PageProp/notoc
  meta that gets the mw:Object/Template typeof attached to it.
  It is not okay to delete it!

* Fixes regression on en:List of Soviet physicists and other such
  pages that regressed because of changes in commit 13a70f26.

* No change in parser tests (TODO: Can we concoct a test for this case?)

Change-Id: Ieb2787682c9e85d11dd3eefbcf6a236e7ed0a53e
Merge "Dont strip non-marker meta nodes even if they have a marker typeof."