ParticipantMaxCountTest fix

Webtest fix for 
WebTest_Event_PricesetMaxCountTest::testAdditionalParticipantWithoutFieldCount
WebTest_Event_PricesetMaxCountTest::testAdditionalParticipantWithFieldCount
WebTest_Event_PricesetMaxCountTest::testWithFieldCount
WebTest_Event_PricesetMaxCountTest::testWithoutFieldCount