fix(forms) Add a hidden submit at beginning of form

This avoids problems when submitting forms using enter.
In management pages it would reset the base to root as the root button
 was the first submit in the form.

issue #6033

ihtml/themes/breezy/framework.tpl

@@ -3,6 +3,7 @@
   {$game_screen}
   {$php_errors}
   <form action="main.php{$plug}" name="mainform" id="mainform" method="post" enctype="multipart/form-data">
+    <div style="width: 0; height: 0; overflow: hidden;"><input type="submit" name="default_submit_hidden_button"/></div>
     <div class="setup-header">
       <div id="header-left">
         <img id="fd-logo" class="optional" src="geticon.php?context=applications&amp;icon=fusiondirectory&amp;size=48" alt="FusionDirectory logo"/>