Ensure registry command argument is double-quoted on Windows

[mrclary]

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

Fixes spyder-ide/spyder#22844

"%*" appears to be ineffective on Windows, and menuinst strips explicit quotes, e.g. "\"%1\"".

Upon investigating menuinst source code (https://github.com/conda/menuinst/blob/903ae24739b48748cb5ad60c2bf3ac1c1febfbd6/menuinst/utils.py#L159-L171), a workaround is to add a space at the end of the argument.

This ensures that the "%1" is double-quoted in the registry command, allowing files/paths with spaces to be handled correctly.

See conda/menuinst#290

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

I do have some suggestions for making it better though...

For recipe/meta.yaml:

• ℹ️ The recipe is not parsable by parser conda-souschef (grayskull). This parser is not currently used by conda-forge, but may be in the future. We are collecting information to see which recipes are compatible with grayskull.

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[ccordoba12]

Thanks @mrclary!