Revert "systemctl: skip native unit file handling if sysv file handling already handled everything"

This patch only makes sense on top of patches which fix unit name
mangling when --root is used, but those patches have not been
cherry-picked for this branch.

This reverts commit 3a02c6b4dc.

https://bugzilla.redhat.com/show_bug.cgi?id=1128308

src/systemctl/systemctl.c

@@ -4232,11 +4232,6 @@ static int enable_unit(DBusConnection *bus, char **args) {
         if (!args[1])
                 return 0;
 
-        /* If the operation was fully executed by the SysV compat,
-         * let's finish early */
-        if (strv_isempty(mangled_names))
-                return 0;
-
         if (!bus || avoid_bus()) {
                 if (streq(verb, "enable")) {
                         r = unit_file_enable(arg_scope, arg_runtime, arg_root, args+1, arg_force, &changes, &n_changes);