fix: pass _isRoot context where missing

[wraithgar]

fixes: #9189

[owlstronaut]

LGTM

[akhenry]

Seems like maybe there's a sketchy test here as well - https://github.com/npm/cli/pull/8943/changes#diff-8ab375e634149f489e0f560b62170ee8770114b25f0d314c83e0493c5b2bf02bR259

[wraithgar]

The test was fine, it's a negative test (i.e. refuses a situation). There is no positive test (i.e. allows the situation) and that's what would have caught this.

[akhenry]

The test was fine, it's a negative test (i.e. refuses a situation). There is no positive test (i.e. allows the situation) and that's what would have caught this.

Even if it's a negative test, it doesn't actually set allow-git to root, so it doesn't seem to be testing what it says it's testing:

[akhenry]

In any case, thank you for addressing this issue so quickly! Appreciate it.