NRL-2005 Rename NRL-App-ID header to be compatible with future proxygeygen custom header

Author: anjalitrace2-nhs

proxies/live/apiproxy/resources/jsc/NrlAppId.SetRequestHeaders.js

@@ -1,9 +1,8 @@
 (function () {
   const nrlAppID = context.getVariable("app.nrl-app-id");
   if (nrlAppID) {
-    context.targetRequest.headers["NHSD-NRL-App-ID"] = nrlAppID;
-  }
-  else {
-    context.targetRequest.headers["NHSD-NRL-App-ID"] = "NotProvided";
+    context.targetRequest.headers["X-Proxygen-App-NRL-App-ID"] = nrlAppID;
+  } else {
+    context.targetRequest.headers["X-Proxygen-App-NRL-App-ID"] = "NotProvided";
   }
 })();