EventServiceTest: remove unused imports

Author: ctrueden

src/test/java/org/scijava/event/EventServiceTest.java

@@ -40,9 +40,7 @@
 
 import org.junit.Test;
 import org.scijava.Context;
-import org.scijava.plugin.Plugin;
 import org.scijava.service.AbstractService;
-import org.scijava.service.Service;
 import org.scijava.service.event.ServicesLoadedEvent;
 
 /**