frontend/transport: fix onAndroidCallResponse type

It returns `any` (whatever JSON the backend handler returns), not
`string`, just like the functions that call this: `apiGet()` and
`apiPost()`.

frontends/web/src/globals.d.ts

@@ -22,7 +22,7 @@ export declare global {
         android?: {
             call: (queryID: number, query: string) => void;
         }
-        onAndroidCallResponse?: (queryID: number, response: string) => void;
+        onAndroidCallResponse?: (queryID: number, response: any) => void;
         onAndroidPushNotification?: (msg: TPayload) => void;
     }
 }

frontends/web/src/utils/transport-android.ts

@@ -22,13 +22,13 @@ let queryID: number = 0;
 const queryPromises: TQueryPromiseMap = {};
 const currentListeners: TMsgCallback[] = [];
 
-export function androidCall(query: string) {
+export function androidCall(query: string): Promise<any> {
   return new Promise((resolve, reject) => {
     if (runningInAndroid()) {
       if (typeof window.onAndroidCallResponse === 'undefined') {
         window.onAndroidCallResponse = (
           queryID: number,
-          response: string,
+          response: any,
         ) => {
           queryPromises[queryID].resolve(response);
           delete queryPromises[queryID];

frontends/web/src/utils/transport-qt.ts

@@ -51,7 +51,7 @@ async function initTransport() {
   return webChannel;
 }
 
-export function call(query: string) {
+export function call(query: string): Promise<any> {
   return new Promise((resolve, reject) => {
     initTransport().then((channel: any) => {
       queryID++;