troubleshooting: adjust home path in tip 44

Modify the home dir path in troubleshooting tip 44
to prevent files from being accidentally removed.

userdel with force argument tries to remove home dir path "/"
according to
https://github.com/shadow-maint/shadow/issues/1050

Signed-off-by: Erik Sjölund <erik.sjolund@gmail.com>

troubleshooting.md

@@ -1517,8 +1517,7 @@ The following steps create the user _containers_ and assigns big subuid and subg
 1. Create the user _containers_
    ```
    sudo useradd --comment "Helper user to reserve subuids and subgids for Podman" \
-		--no-create-home \
-                --home-dir / \
+                --no-create-home \
                 --shell /usr/sbin/nologin \
                 containers
    ```