ref(TS) Improve TS (#13365)

Change some any types to the correct types

react/features/app/components/AbstractApp.ts

@@ -12,7 +12,7 @@ export interface IProps {
      * XXX Refer to the implementation of loadURLObject: in
      * ios/sdk/src/JitsiMeetView.m for further information.
      */
-    timestamp: any;
+    timestamp: number;
 
     /**
      * The URL, if any, with which the app was launched.

react/features/app/components/App.web.tsx

@@ -42,7 +42,7 @@ export class App extends AbstractApp {
      *
      * @override
      */
-    _createMainElement(component: React.ComponentType, props: any) {
+    _createMainElement(component: React.ComponentType, props?: Object) {
         return (
             <JitsiThemeProvider>
                 <GlobalStyles />