no-jira: remove import of edu.emory

src/main/java/org/olat/modules/vitero/ui/ViteroBookingsController.java

@@ -19,6 +19,7 @@
  */
 package org.olat.modules.vitero.ui;
 
+import java.util.Collections;
 import java.util.List;
 
 import org.olat.core.CoreSpringFactory;
@@ -42,8 +43,6 @@ import org.olat.modules.vitero.manager.VmsNotAvailableException;
 import org.olat.modules.vitero.model.StartBookingComparator;
 import org.olat.modules.vitero.model.ViteroBooking;
 
-import edu.emory.mathcs.backport.java.util.Collections;
-
 /**
  * 
  * Description:<br>