Jupyter experimental debugging setting should not be machine scoped

I should be able to set this in user settings in a remote window. "Machine" scoped settings are typically things like paths to binaries that are only valid on one machine.

https://github.com/microsoft/vscode-jupyter/blob/a068633dd5c8cba861c208046fab616139c4678d/package.json#L1546-L1546

https://github.com/microsoft/vscode/issues/129467#issuecomment-887928755