refactoring: tests: use scimoz styling functions instead of setStyles

This better matches the actual scinitlla API.

(integrated from komodo (trunk) change 81272 by marky)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13379 b87d16e7-d29f-4ee1-b5ec-817d645d335f