fixed the subject choice print api with the new api payload (#10)

* fetching fines, fees summary and elective & subject choice endpoint added

* fix: updated subject preference endpoint coz api changes

* made it consistent with othet apis

Author: tashifkhan

src/wrapper.js

@@ -547,11 +547,12 @@ export class WebPortal {
    */
   async get_subject_choices(semester) {
     const ENDPOINT = "/studentchoiceprint/getsubjectpreference";
-    const payload = {
+
+    const payload = await serialize_payload({
       instituteid: this.session.instituteid,
-      studentid: this.session.memberid,
+      clientid: this.session.clientid,
       registrationid: semester.registration_id,
-    };
+    });
     const resp = await this.__hit("POST", API + ENDPOINT, { json: payload, authenticated: true });
     return resp["response"];
   }