fixup! fixup: ERP5TypeFunctionalTestCase: support running tests on seleniumserver

we only want to set options to None when not using firefox, but we use firefox
by default. See dicussion on 17e1c262 (comment 136933)
10 jobs for for_testrunner_1 in 0 seconds
Status Job ID Name Coverage
  External
failed ERP5.CodingStyleTest-Master

00:48:59

failed ERP5.CodingStyleTest-TestRunner1

01:08:27

passed ERP5.PerformanceTest-Master

00:24:21

passed ERP5.PerformanceTest-TestRunner1

00:24:23

failed ERP5.UnitTest-Master

04:24:52

failed ERP5.UnitTest-Master.Medusa

03:15:13

failed ERP5.UnitTest-TestRunner1

06:00:29

passed SlapOS.Eggs.UnitTest-Master.Python2

00:11:15

passed SlapOS.Eggs.UnitTest-Master.Python3

passed SlapOS.Eggs.UnitTest-Master.Python3

00:07:14