cleanup NXlens_em

Author: lukaspie

base_classes/NXlens_em.nxdl.xml

@@ -106,10 +106,10 @@ with other research fields (MPES, XPS, OPT) could be useful-->
             <item value="octupole"/>
             <item value="dodecapole"/>
         </enumeration>
+    </field>
     <group type="NXfabrication"/>
     <group type="NXprogram"/>
-    </field>
-        <field name="depends_on" type="NX_CHAR">
+    <field name="depends_on" type="NX_CHAR">
         <doc>
             Specifies the position of the electromagnetic lens by pointing to the last
             transformation in the transformation chain that is defined