Set webcamsOnlyForModerator in MeetingActor when the meeting is creator.

...n/scala/org/bigbluebutton/core/running/MeetingActor.scala

...b/src/main/java/org/bigbluebutton/api/MeetingService.java

...rc/main/scala/org/bigbluebutton/api2/BbbWebApiGWApp.scala