Removed unnecessary using statement related to Unity analytics

[coreyjharvey]

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Please check if your PR fulfills the following requirements:

• [n/a] Tests for the changes have been added (for bug fixes / features)
• [n/a] Docs have been reviewed and added / updated if needed (for bug fixes / features)
• No compiler errors or warnings

Pull request type

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• Bugfix
• Feature
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Issue Number

Issue Number: N/A

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What is the current behavior?

This using statement is unnecessary and causes build issues for some people, according to gitter chat

What is the new behavior?

No build issues

Does this introduce a breaking change?

• Yes
• No

Other information

On which Unity version has this been tested?

• 2020.4 LTS
• 2020.3
• 2020.2
• 2020.1
• 2019.4 LTS
• 2019.3
• 2019.2
• 2019.1
• 2018.4 LTS

Scripting backend:

• Mono
• IL2CPP

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[Mathijs-Bakker]

Yeah that doesn't belong there. Probably an LSP autocompletion thing.