Fix duplicate warnings with `raw` calls
Fix duplicate warnings with `raw` calls

There was a bit of a logic error here, because a
warning might be detected as a duplicate in
`check_for_immediate_xss`, causing it to return 'false'
and then the check would go ahead and process the `raw` call.
This would result in 'weak' confidence warnings that were
duplicates of 'high' confidence warnings.

jeffyip/brakeman,bf4/brakeman,lee-leon/brakeman,spcoder/brakeman,liqites/brakeman,cheerfulstoic/brakeman,dfens/brakeman,htdc/brakeman,jlecour/brakeman,lee-leon/brakeman,dfens/brakeman,bf4/brakeman,jakeatwork/brakeman,kbrock/brakeman,liqites/brakeman,codeclimate/brakeman-deprecated,cheerfulstoic/brakeman,masarakki/brakeman,jlecour/brakeman,oreoshake/brakeman,kbrock/brakeman,jakeatwork/brakeman,github/brakeman,jlecour/brakeman,github/brakeman,codeclimate/brakeman-deprecated,oreoshake/brakeman,htdc/brakeman,dfens/brakeman,lee-leon/brakeman,kbrock/brakeman,jakeatwork/brakeman,spcoder/brakeman,jeffyip/brakeman,liqites/brakeman,spcoder/brakeman,htdc/brakeman,masarakki/brakeman,masarakki/brakeman,bf4/brakeman,cheerfulstoic/brakeman