Fix websocket keyword arg error

Keyword 'esel_utils.Create eSEL' expected 1 argument, got 0.

Changes:
    Pass RAW_PREFIX to the keyword

Tested:
    NA

Change-Id: Iaf7ea1f2c849ebf30d432408c11fb02f05d73b3d
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/redfish/extended/test_websocket.robot b/redfish/extended/test_websocket.robot
index a454f86..906b02c 100755
--- a/redfish/extended/test_websocket.robot
+++ b/redfish/extended/test_websocket.robot
@@ -53,7 +53,7 @@
     ${initial_esel_count}=  Get Number Of Event Logs
 
     # Generate eSEL (e.g.  typically "CPU 1 core 3 has failed").
-    Create eSEL
+    Create eSEL  ${RAW_PREFIX}
 
     ${current_esel_count}=   Get Number Of Event Logs