nuageinit(7) tests: Fix extra space in test output expectation

This fixes the test case libexec.nuageinit.nuageinit.config2_userdata_packages

Signed-off-by: Siva Mahadevan <me@svmhdvn.name>

Event: Kitchener-Waterloo Hackathon 202506
Sponsored by: The FreeBSD Foundation
Pull Request: https://github.com/freebsd/freebsd-src/pull/1734