ErrorPageTest: Reset env state
ErrorPageTest: Reset env state

Otherwise SapphireTest will complain, see 0da70dafa457564a6adb02140ffeb5dd01f3a982

silverstripe/silverstripe-siteconfig,dhensby/silverstripe-reports,jonom/silverstripe-cms,jonom/silverstripe-cms,silverstripe/silverstripe-cms,silverstripe-labs/silverstripe-reports,dhensby/silverstripe-cms,silverstripe/silverstripe-cms,helpfulrobot/i-lateral-silverstripe-siteconfig,silverstripe-labs/silverstripe-reports,dhensby/silverstripe-cms,dhensby/silverstripe-cms,dhensby/silverstripe-reports