remove unused import

uk/ac/sanger/artemis/components/alignment/GroupBamFrame.java

@@ -12,8 +12,6 @@ import java.awt.event.ItemEvent;
 import java.awt.event.ItemListener;
 import java.util.HashMap;
 import java.util.Iterator;
-import java.util.List;
-import java.util.Vector;
 
 import javax.swing.Box;
 import javax.swing.JButton;