(Bug 56387) Refined quote wt-escape handler

* Updated an existing html2wt parser test (which continues to
  pass html2wt mode but which would have failed without this patch).
* While no new tests pass, eliminates unnecessary nowikis from a
  bunch of blacklisted selser tests.

Change-Id: I5299131ae3078dc30ed30b29d1e9726799264947
Merge "(Bug 56387) Refined quote wt-escape handler"