Delete trailing comma

Bad merge resolution from prior commit? Fixes json parsers error.

Bug: 63089991

Test: test/testrunner/testrunner.py --host --verbose

Change-Id: I951e9b022883f983c1fabbd1eac5ced846f466e7
diff --git a/test/knownfailures.json b/test/knownfailures.json
index e1be67a..69421de 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -727,5 +727,5 @@
         ],
         "description": [ "Disable the jvmti can_suspend cap and associated tests" ],
         "bug": "b/63579748"
-    },
+    }
 ]