fix: fix auto-collapse title for viewing trainwreck txn

tailbone/templates/form.mako

@@ -47,7 +47,7 @@
             </span>
 
             &nbsp;
-            <strong>Transaction Header</strong>
+            <strong>${main_form_title}</strong>
           </div>
         </template>
         <div class="panel-block">

tailbone/views/trainwreck/base.py

@@ -270,6 +270,7 @@ class TransactionView(MasterView):
             kwargs['custorder_xref_markers_data'] = markers
 
         # collapse header
+        kwargs['main_form_title'] = "Transaction Header"
         kwargs['main_form_collapsible'] = True
         kwargs['main_form_autocollapse'] = config.get_bool(
             'tailbone.trainwreck.view_txn.autocollapse_header',