removeListener not removing listeners

[harmonherring]

This is the code being referenced in the background component

According to Overwolf docs

The callback should be the same function that was passed to addListener() so this won’t work with anonymous function

This usage in the background function uses anonymous functions, and so the listeners aren't being removed. Since the background window is mounted and unmounted several times this results in several identical listeners being registered, a situation that's also called out in the docs

We’ve seen situations where apps would register addListener multiple times for the same event – this caused the event to be triggered multiple times and causes unexpected bugs and memory leaks. Please pay attention when registering to events and prevent it.