WTS separators: strong/weak indent-pre suppression applies always

* The indent-pre suppression checks were only being tested in
  the parent-child separator scenario whereas it is applicable
  in all scenarios.

* Added a new test for this which now passes (and used to fail
  before this patch).

* Fixes nowiki regressions in
  http://localhost:8000/_rt/hiwiki/%E0%A4%B2%E0%A5%88%E0%A4%B5%E0%A5%87%E0%A4%82%E0%A4%A1%E0%A4%B0

Change-Id: Icd64071bb1bab9ffeb4888bdeb4f03dc0fb516b6
Merge "WTS separators: strong/weak indent-pre suppression applies always"