Missing import

Author: subhramit

jabgui/src/main/java/org/jabref/gui/commonfxcontrols/SaveOrderConfigPanel.java

@@ -1,6 +1,7 @@
 package org.jabref.gui.commonfxcontrols;
 
 import java.util.List;
+import java.util.stream.Collectors;
 
 import javax.swing.undo.UndoManager;