refactor(incentives): remove redundant param from CreateGaugeRefKeys (backport #6511)

[mergify]

This is an automatic backport of pull request #6511 done by Mergify.
Cherry-pick of 1e83ec9 has failed:

On branch mergify/bp/v19.x/pr-6511
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	both modified:   CHANGELOG.md
	both modified:   x/incentives/keeper/gauge.go

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[p0mvn]

Will fix in the next PR