Disabled src-based RTing of tpls and exts to get this code RT tested

* We want to test the following codepaths more aggressively
  - data-mw based rting of tpls and extensions
  - tpl-arg nowiki protection code

* So, at the risk of more diff noise in RT testing, we are turning
  this off and want to run this on our 160K test wiki pages and
  discover bugs in the above code paths.

Change-Id: Ib457263d298898b9ce552e80344d4308ea4e8c12