Updated replication.master.slaves.Offset NRQL

[rossfromwork]

Corrected NRQL used for Replication byte offset widget.

Changed from average(replication.master.slaves.Offset) to average('replication.master.slaves.Offset')

Summary

A concise description of the changes being introduced. Please review the pre-merge checklist section to validate this pull request is ready for review and merge. If it is not ready, please mark the pull request as a draft.

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[CLAassistant]

All committers have signed the CLA.

[sjyothi54]

LGTM

[nr-mlosier]

Closing so we can re-open fresh against newrelic:release and make sure the FOSSA CLI check runs