chore: use solomachine setClientState helper on updates

[damiannolan]

Description

• Updating 06-solomachine to use setClientState helper in update funcs

closes: #1887

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• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[colin-axner]

Aye! Thank you!