Fix GUI automation testcase of system information in overview page

Change-Id: I72d1c34c0366cf4366c713491c7649d89dc89138
Signed-off-by: manashsarma <manashsarma@in.ibm.com>
diff --git a/gui/gui_test/overview_menu/test_overview_menu.robot b/gui/gui_test/overview_menu/test_overview_menu.robot
index 2dc553b..65093a4 100644
--- a/gui/gui_test/overview_menu/test_overview_menu.robot
+++ b/gui/gui_test/overview_menu/test_overview_menu.robot
@@ -82,7 +82,7 @@
     Page Should Contain  ${redfish_serial_number}
 
     ${redfish_motherboard_manufacturer}=  Redfish.Get Attribute
-    ...  ${REDFISH_CHASSIS_URI}motherboard  Manufacturer
+    ...  /redfish/v1/Systems/system/  Manufacturer
 
     Page Should Contain  ${redfish_motherboard_manufacturer}