set safe.directory when getting config for git-annex-shell or git remotes

Fix more breakage caused by git's fix for CVE-2022-24765, this time
involving a remote (either local or ssh) that is a repository not owned by
the current user.

Sponsored-by: Dartmouth College's DANDI project

Git/Construct.hs

@@ -287,5 +287,6 @@ newFrom l = Repo
 	, gitEnvOverridesGitDir = False
 	, gitGlobalOpts = []
 	, gitDirSpecifiedExplicitly = False
+	, safeDirectory = False
 	}