WorldControl: use event by default (#531)

Signed-off-by: Steve Peters <[email protected]>

src/plugins/world_control/WorldControl.cc

@@ -68,9 +68,9 @@ namespace plugins
  public: bool lastStatsMsgPaused{true};
 
  /// \brief Whether server communication should occur through an event (true)
- /// or service (false). The service option is used by default for
- /// gz-gui6, and should be changed to use the event by default in gz-gui7.
- public: bool useEvent{false};
+ /// or service (false). The service option was used by default for
+ /// gz-gui7 and earlier, and now uses the event by default in gz-gui8.
+ public: bool useEvent{true};
  };
 }
 }