knownfailures: Remove trailing semicolon.

Test: art/test/testrunner/run_build_test_target.py -j110 art-test-javac
Change-Id: I6b460c3b34989b3dddd808fcbe1cdd41c70ae288
diff --git a/test/knownfailures.json b/test/knownfailures.json
index 616a37b..96c2967 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -651,7 +651,7 @@
             "969-iface-super",
             "981-dedup-original-dex",
             "984-obsolete-invoke",
-            "985-re-obsolete",
+            "985-re-obsolete"
         ],
         "description": "The tests above fail with --build-with-javac-dx.",
         "env_vars": {"ANDROID_COMPILE_WITH_JACK": "false"},