test: Fix failing e2e test

[bermuell]

Description

Closes: #1167

This PR fixes an error in the e2e test.
When running e2e tests

• tests did not check expected error condition in assignConsumerPubKey
• transaction command to assign consensus key did not return error until '--gas auto' option was provided

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[MSalopek]

Please apply the suggested comment - it will print out the err and the response.

Approve!

[p-offtermatt]

Thanks for investigating this!
If you want, you could dive into why this needs gas auto, investigating this might be an admittedly rough way to dive deeper into the Cosmos SDK. I think it's not strictly necessary and I'd be happy with the current state, too.

[p-offtermatt]

Thanks for addressing my comments, feel free to merge