JavaScript: Update expected test output.

Author: Max Schaefer

javascript/ql/test/library-tests/StringConcatenation/ClassContainsTwo.expected

@@ -1,3 +1,7 @@
+| closure.js:5:1:5:37 | build(' ... 'four') |
+| closure.js:5:1:5:46 | build(' ...  'five' |
+| closure.js:5:14:5:18 | 'two' |
+| closure.js:5:14:5:28 | 'two' + 'three' |
 | tst.js:3:3:3:12 | x += "two" |
 | tst.js:3:8:3:12 | "two" |
 | tst.js:4:3:4:3 | x |