hugo import jekyll: Fixed target path location check

[JelmerT]

I ran into the following error:

~/Workspace/jelmertiete.com-hugo$ hugo import jekyll ../jelmertiete.com .
Error: Target path should not be inside the Jekyll root, aborting.

Note that I'm trying to import into a folder named jelmertiete.com-hugo from a folder named jelmertiete.com, both in the same directory, which shouldn't throw an error.

Problem was the HasPrefix on the full path. Changed it to a HasPrefix on the directory instead.

[github-actions]

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