R4R staking lcd bugfix

[rigelrozanski]

Use the owner address instead of pubkey address in queries,
Also no more iteration to find a validator, see this issue for more:

Closes #2032

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.
• NEED MORE lcd docs! - Updated all relevant documentation (docs/)
• Updated all relevant code comments
• Wrote tests
• Added entries in PENDING.md that include links to the relevant issue or PR that most accurately describes the change.

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[fedekunze]

utACK

[cwgoes]

utACK, although maybe this could use the "CLI keeper" PR @sunnya97 is working on to be a bit cleaner

[alexanderbez]

utACK -- Thanks @rigelrozanski