Remove persisted portID's for interchain accounts

[colin-axner]

Summary

Remove persisted state from interchain accounts

Problem Definition

Upon init genesis, ics27 persists information such as the portID that is never referenced by during regular processes. It might have been thought that this information is required to regenerate capabilities upon a genesis restart, but the capability module will handle this automatically

Proposal

Remove unnecessary persisted portIDs in host/controller. We may consider writing a small migration handler to remove existing state. Otherwise the setPort functions can be removed from the host and controller submodules.

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