Pusher cluster is explicitly set on client

[bighitbiker3]

Describe the bug
The bug occurs when you create a pusher instance that is not in cluster us2. My cluster created was in us3 and I wasn't receiving the channel messages. I narrowed it down to this line here which explicitly sets the cluster to us2. I think this should be using the environment variable set in the application.

I'm happy to keep digging in, but am not sure if this is intentional or not. Am I misinterpreting something?

To Reproduce

1. Create a pusher Channel's instance that is not in us2.
2. Try to use chat

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