David Iglesias dfd9ef5e60 [web] Fix HashUrlStrategy.addPopStateListener (flutter/engine#41384)
During a JS-interop refactor, we introduced a small bug in the `addPopStateListener` method of the `HashUrlStrategy` object (web).

This wasn't caught before because the existing tests were mocking the refactored code.

## Issues

Fixes: https://github.com/flutter/flutter/issues/125228

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
2023-04-21 17:26:31 +00:00
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