Only issue warning about DM status confusion, if person is not a DM yet

Being able to apply for dm_ga is not relevant here, because that is also the case for DMs.

Signed-off-by: Mattia Rizzolo <mattia@debian.org>

process/templates/process/create.html

@@ -17,7 +17,7 @@
 </ul>
 {% endif %}
 
-{% if "dm" in person.possible_new_statuses or "dm_ga" in person.possible_new_statuses %}
+{% if "dm" in person.possible_new_statuses  %}
 <div class="important">
 <p><strong>{% trans "About the role of Debian Maintainer:" %}</strong> 
 {% blocktrans %}the role of <em>Debian Maintainer</em> occasionally gets confused with that of