Update skip list for UE NX test case from RAS test bucket

Reason: NXDMAENG UE error injection is not available
in latest p9dd1ffdcv104.xls

Change-Id: I1ae4765e313191cd34c544ad1331c7126e7ff2fd
Signed-off-by: Sridevi Ramesh <sridevra@in.ibm.com>
diff --git a/test_lists/skip_test_witherspoon b/test_lists/skip_test_witherspoon
index 1ac4b00..617ec2d 100644
--- a/test_lists/skip_test_witherspoon
+++ b/test_lists/skip_test_witherspoon
@@ -15,3 +15,5 @@
 -e Test_Heartbeat_LED_And_Verify_Via_REST
 -e Test_Beep_LED_And_Verify_Via_REST
 -e Test_Identify_LED_And_Verify_Via_REST
+# NXDMAENG UE error injection is not available in latest p9dd1ffdcv104.xlsm
+-e Verify_Unrecoverable_Callout_Handling_For_NXDMAENG