op-mode: T6367: fix "force commit-archive" TypeError

/usr/bin/config-mgmt requires an argument OR to be symbolically linked to
*commit-revision or *commit-archive, for which it interprets argv[0] through
the useful trickery:

https://github.com/vyos/vyos-1x/blob/current/python/vyos/config_mgmt.py#L693-L700

Traceback (most recent call last):
  File "/usr/bin/config-mgmt", line 33, in <module>
    sys.exit(load_entry_point('vyos==1.3.0', 'console_scripts', 'config-mgmt')())
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/vyos/config_mgmt.py", line 746, in run
    func = getattr(config_mgmt, args['subcommand'])
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: attribute name must be string, not 'NoneType'

op-mode-definitions/force-commit-archive.xml.in

@@ -6,7 +6,7 @@
         <properties>
           <help>Manually archive configuration</help>
         </properties>
-        <command>/usr/bin/config-mgmt</command>
+        <command>/etc/commit/post-hooks.d/02vyos-commit-archive; printf "\n"</command>
       </leafNode>
     </children>
   </node>