fix: restore interim announce ability (ietf-tools#6410)

Author: rjsparks

ietf/templates/meeting/interim_send_announcement.html

@@ -13,15 +13,15 @@ <h1>Announce Interim Meeting</h1>
         {% csrf_token %}
         <div class="row mb-3">
             <label for="{{ form.to.id_for_label }}" class="col-md-2 fw-bold col-form-label">To</label>
-            <div class="col-md-10">{% render_field form.to class="form-control" disabled="disabled" %}</div>
+            <div class="col-md-10">{% render_field form.to class="form-control" readonly="readonly" %}</div>
         </div>
         <div class="row mb-3">
             <label for="{{ form.cc.id_for_label }}" class="col-md-2 fw-bold col-form-label">Cc</label>
             <div class="col-md-10">{% render_field form.cc class="form-control" %}</div>
         </div>
         <div class="row mb-3">
             <label for="{{ form.frm.id_for_label }}" class="col-md-2 fw-bold col-form-label">From</label>
-            <div class="col-md-10">{% render_field form.frm class="form-control" disabled="disabled" %}</div>
+            <div class="col-md-10">{% render_field form.frm class="form-control" readonly="readonly" %}</div>
         </div>
         <div class="row mb-3">
             <label for="{{ form.subject.id_for_label }}" class="col-md-2 fw-bold col-form-label">Subject</label>