Delete manifests/t/Treexy/OmnifyHotspot directory

[TreexySoftware]

The installers are no longer available.

Checklist for Pull Requests

• [X] Have you signed the Contributor License Agreement?
• [ ] Is there a linked Issue?

Manifests

• [X] Have you checked that there aren't other open pull requests for the same manifest update/change?
• [ ] This PR only modifies one (1) manifest
• [X] Have you validated your manifest locally with winget validate --manifest <path>?
• [X] Have you tested your manifest locally with winget install --manifest <path>?
• [X] Does your manifest conform to the 1.9 schema?

Note: <path> is the directory's name containing the manifest you're submitting.

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Microsoft Reviewers: Open in CodeFlow

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[wingetbot]

/AzurePipelines run

[wingetbot]

/AzurePipelines run

[TreexySoftware]

Unrelated.