Revert filename to inputfile

Fixed a change made in consent-journey and repeated here

Author: simonnorris1

performance-tests/E2E/nurse-journey.jmx

@@ -92,7 +92,7 @@
           </elementProp>
           <elementProp name="InputFile" elementType="Argument">
             <stringProp name="Argument.name">InputFile</stringProp>
-            <stringProp name="Argument.value">${__P(FileName, null)}</stringProp>
+            <stringProp name="Argument.value">${__P(InputFile, null)}</stringProp>
             <stringProp name="Argument.metadata">=</stringProp>
           </elementProp>
           <elementProp name="URN" elementType="Argument">