testing: don't color the cgns test

The cellNormals isn't availble in OpenGL2. Instead, just use the default
coloring.

Testing/TestData-5blocks_cgns.xml

@@ -2,7 +2,6 @@
 <pqevents>
   <pqevent object="pqClientMainWindow/propertiesDock/propertiesPanel/Accept" command="activate" arguments="" />
   <pqevent object="pqClientMainWindow/representationToolbar/displayRepresentation/comboBox" command="set_string" arguments="Surface" />
-  <pqevent object="pqClientMainWindow/variableToolbar/displayColor/Variables" command="set_string" arguments="Result" />
   <pqevent object="pqClientMainWindow/variableToolbar/displayColor" command="mousePress" arguments="1,1,0,93,28" />
   <pqevent object="pqClientMainWindow/variableToolbar/displayColor" command="mouseMove" arguments="1,0,0,94,29" />
   <pqevent object="pqClientMainWindow/variableToolbar/displayColor" command="mouseRelease" arguments="1,0,0,94,29" />