Remove confirm template obsolete uses (except for contacts)

- Remove obsolete explode_querystring() function
- Remove $extra_inputs template variable

view/theme/frio/templates/confirm.tpl

@@ -1,9 +1,6 @@
 
 <form action="{{$confirm_url}}" id="confirm-form" method="{{$method}}" class="generic-page-wrapper">
 	<div id="confirm-message">{{$message}}</div>
-	{{foreach $extra_inputs as $input}}
-	<input type="hidden" name="{{$input.name}}" value="{{$input.value}}" />
-	{{/foreach}}
 
 	<div class="form-group pull-right settings-submit-wrapper" >
 		<button type="submit" name="{{$confirm_name}}" id="confirm-submit-button" class="btn btn-primary confirm-button" value="{{$confirm}}">{{$confirm}}</button>