ParserTestRunner: Get rid of user-specific option

ParserTestRunner: Get rid of user-specific option

* Parsoid currently doesn't have user state in SiteConfig and if test
  config add user-specific state, Parsoid's tests will fail since
  Parsoid\Config\SiteConfig::widthOption uses default options and not
  user-specific state.

  Alternatively, we would have to change SiteConfig code to use $wgUser
  to fetch the option value.

  But, since there is no real reason to use user-specific state in
  parser tests, we can disable this for now.

* Discovered when I enabled Parsoid testing modes for Cite and ran into
  a bunch of crashers.

* Maybe, in the not-so-distant future, we will probably have to figure
  out user-state based parsing since there are features that aren't
  amenable to html2html transformations (ex: {{int:}}) and at that time,
  we can revisit if we want to revert this change.

Change-Id: I316fe01608acf38a08df74bdff87040179461028