JavaScript: Remove an unused import in TrapTests.java.

Author: Max Schaefer

javascript/extractor/src/com/semmle/js/extractor/test/TrapTests.java

@@ -5,7 +5,6 @@
 import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 import java.util.Map.Entry;