Cut out entirely line in default section. re #9259

Identified by russell to not satisfy schema and which serves no purpose

Code/Mantid/instrument/MUT_Definition_32_detectors.xml

@@ -11,8 +11,7 @@
 
   <defaults>
     <length unit="meter"/>
-    <angle unit="degree"/>
-    <!-- <parameter eq="" type="double" extract-single-value-as="mean" />  -->     
+    <angle unit="degree"/>     
     <reference-frame>
       <!-- The z-axis is set parallel to and in the direction of the beam. the 
            y-axis points up and the coordinate system is right handed. -->