Short-circuit path shortening logic when possible
Short-circuit path shortening logic when possible

When `os::util::repository_relative_path` is given a path that already
starts with `$OS_ROOT` we can simply truncate the path string to get the
relative path.

Signed-off-by: Steve Kuznetsov <a7da0fca91d9933d2725d731a48cabdc9e8ffd7a@redhat.com>

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