cluster/addons/dashboard: remove inactive members from OWNERS

[mrbobbytables]

ref: kubernetes/org#2456

As a part of cleaning up inactive members (those with no activity within
the past 18 months) from OWNERS files, this commit moves byrk from
approver to emeritus_approver.

/kind cleanup
/assign @jeefy

Does this PR introduce a user-facing change?

NONE

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[mrbobbytables]

/retest

[jeefy]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jeefy, mrbobbytables

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Needs approval from an approver in each of these files:

• cluster/addons/dashboard/OWNERS [jeefy]

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[fejta-bot]

/retest
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