checkstyle fix

Author: litvinovg

api/src/main/java/edu/cornell/mannlib/vitro/webapp/search/controller/SearchFiltering.java

@@ -8,7 +8,6 @@
 import java.util.Comparator;
 import java.util.Enumeration;
 import java.util.HashMap;
-import java.util.Iterator;
 import java.util.LinkedHashMap;
 import java.util.LinkedList;
 import java.util.List;