Move 'DetectedEvent' in the lua types xml to classes

[WolfGangS]

Description

Moves the DetectedEvent for slua in the types xml to the classes section, as required for secondlife/sl-vscode-plugin#3

Related Issues

• DetectedEvent in the type defs for luau should be a class sl-vscode-plugin#3

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Checklist

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Unsure about tests, don't think there are any.

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Additional Notes

This should have no real impact on the viewer itself, as the file is only loaded to be served over the web socket created for the vscode extension.

[Rider-Linden]

... which you have.
Thank you for the catch.