fix bug with sed conditional check during permit root login

If the sshd_config line has a '#" character the original code would fail to enable root logins and fail the whole test.  This fixes that by making the '#' character optional.

This fix will ensure any of the following permutations will be set to allow root logins.

```shell
 #PermitRootLogin no
 #PermitRootLogin yes
 PermitRootLogin no
 PermitRootLogin yes


```