container/init: unwrap path errors

These are also now handled by init properly, so wrapping them in self is meaningless and unreachable.

Signed-off-by: Ophestra <cat@gensokyo.uk>

container/output.go

@@ -17,10 +17,3 @@ func wrapErrSuffix(err error, a ...any) error {
 	}
 	return msg.WrapErr(err, append(a, err)...)
 }
-
-func wrapErrSelf(err error) error {
-	if err == nil {
-		return nil
-	}
-	return msg.WrapErr(err, err.Error())
-}