Only show the btn_edit_as_txt_record_txt button to admins

interface/web/dns/templates/dns_spf_edit.htm

@@ -53,7 +53,9 @@
             
         <div class="clear"><div class="right">
             <button class="btn btn-default formbutton-success" type="button" value="{tmpl_var name='btn_save_txt'}" data-submit-form="pageForm" data-form-action="dns/dns_spf_edit.php">{tmpl_var name='btn_save_txt'}</button>
+            <tmpl_if name="is_admin">
             <button class="btn btn-default formbutton-default" type="button" value="{tmpl_var name='btn_edit_as_txt_record_txt'}" data-load-content="dns/dns_txt_edit.php?id={tmpl_var name='id'}&zone={tmpl_var name='zone'}&edit_raw=1">{tmpl_var name='btn_edit_as_txt_record_txt'}</button>
+            </tmpl_if>
             <button class="btn btn-default formbutton-default" type="button" value="{tmpl_var name='btn_cancel_txt'}" data-load-content="dns/dns_soa_edit.php?id={tmpl_var name='zone'}&next_tab=dns_records">{tmpl_var name='btn_cancel_txt'}</button>
         </div></div>