[dogstatsd] Correct inverted constants

[prognant]

What does this PR do?

Fix inversion while using constants in dogstatsd client.

Description of the Change

Alternate Designs

N/A

Possible Drawbacks

N/A

Verification Process

Issue was observed while capturing packet that were bigger than expected.

Additional Notes

N/A

Release Notes

Review checklist (to be filled by reviewers)

• Feature or bug fix MUST have appropriate tests (unit, integration, etc...)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have one changelog/ label attached. If applicable it should have the backward-incompatible label attached.
• PR should not have do-not-merge/ label attached.
• If Applicable, issue must have kind/ and severity/ labels attached at least.

[olivielpeau]

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