refactor eventsubws subscription error handling to not error on reconnect

Description

Fixes a crash where an optional Future can become None.

[x] If code changes were made then they have been tested.
- [ ] I have updated the documentation to reflect the changes.
- [x] I have updated the changelog with a quick recap of my changes. (note: changelog is in my other pr)
[x] This PR fixes an issue.
[ ] This PR adds something new (e.g. new method or parameters).
[ ] This PR is a breaking change (e.g. methods or parameters removed/renamed)
[ ] This PR is not a code change (e.g. documentation, README, ...)
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