Remove legacy params subspace args from ibc keepers

[damiannolan]

Summary

We recently migrated to self-managed params within our modules. I think we should be able to remove the legacySubspace args from the NewKeeper funcs of each module/submodule within the codebase.

This should be possible for ibc-go/v9 - the next major release of ibc-go.

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[neitdung]

Hi @damiannolan, can I take this one?

[damiannolan]

@neitdung I've assigned you to the issue! Thank you very much <3