Bug 37762: (QA follow-up): Remove obsolete code

This is leftover from original implementation.
It since moved to js/vue/stores/ill.js and is managed by ILL/Main.vue

To test:
1) Access (with ILLModule enabled and disabled):
http://localhost:8081/cgi-bin/koha/ill/ill.pl
2) Confirm you get the module if ILLModule is enabled, or a message if
   it's disabled

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

koha-tmpl/intranet-tmpl/prog/js/fetch/ill-api-client.js

@@ -5,14 +5,6 @@ export class ILLAPIClient {
         });
     }
 
-    get config() {
-        return {
-            get: () => {
-                ILLModule: 1;
-            }, // TODO: Fetch from API
-        };
-    }
-
     get supplying() {
         return {
             get: id =>