Renaming vars 'file changed' to 'file not default'

Author: boeuf-codes

base/uk.ac.stfc.isis.ibex.opis/resources/Eurotherm_single.opi

@@ -1909,7 +1909,7 @@ $(pv_value)</tooltip>
             <value>true</value>
           </exp>
           <pv trig="true">$(PV_ROOT_EURO):LUTON</pv>
-          <pv trig="true">$(PV_ROOT_EURO):RAMP_FILE_CHANGED</pv>
+          <pv trig="true">$(PV_ROOT_EURO):RAMP_FILE_NOT_DEFAULT</pv>
         </rule>
       </rules>
       <scale_options>