Configure the cosmos SDK with correct account prefix

[adshmh]

Summary

The SDK needs to configure the Cosmos SDK with correct account prefix, i.e. "pokt".

Issue

Without this fix, validating the relay response fails:

shannon-sdk/relay.go

Line 44 in dfa95b5

if err := relayResponse.ValidateBasic(); err != nil {

This is because the session header validation would fail if the account prefix is not set to "pokt":

Relay response validation checking the session header:

Session Header validation checking the account is in Bech32 with correct prefix:

https://github.com/pokt-network/poktroll/blob/e5024ea5d28cc94d09e531f84701a85cefb9d56f/x/session/types/session_header.go#L11

NOTE

This is copied (after removing unnecessary settings) from https://github.com/pokt-network/poktroll/blob/e5024ea5d28cc94d09e531f84701a85cefb9d56f/cmd/poktrolld/cmd/config.go#L21

Type of change

Select one or more:

• New feature, functionality or library
• Bug fix
• Code health or cleanup
• Documentation
• Other (specify)

Sanity Checklist

• I have tested my changes using the available tooling
• I have commented my code
• I have performed a self-review of my own code; both comments & source code
• I create and reference any new tickets, if applicable
• I have left TODOs throughout the codebase, if applicable

[Olshansk]

Preemtively approving. Let's be consistent by updating all the prefixes.