[typo-fix] typo of the variable use_count -> wrote use_cound instead

[GalNivs]

Just found this typo as I went through the code trying to learn Istio's internals.

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[venilnoronha]

/ok-to-test
/lgtm
/approve

[venilnoronha]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 0xCA7F00D, venilnoronha

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