fix: handle Result return type from watch_position in use_geolocation

The watch_position_with_error_callback_and_options method now returns
Result<i32, JsValue> instead of i32 in wasm-bindgen 0.2.113. Use .ok()
to convert it to Option<i32>.

Author: emilbonnek

src/use_geolocation.rs

@@ -103,11 +103,11 @@ pub fn use_geolocation_with_options(
                         Closure::wrap(Box::new(on_error) as Box<dyn Fn(web_sys::PositionError)>);
 
                     *watch_handle.lock().unwrap() =
-                        Some(geolocation.watch_position_with_error_callback_and_options(
+                        geolocation.watch_position_with_error_callback_and_options(
                             update_position.as_ref().unchecked_ref(),
                             Some(on_error.as_ref().unchecked_ref()),
                             &position_options,
-                        ));
+                        ).ok();
 
                     update_position.forget();
                     on_error.forget();