(ui) fix footer on sm screen size

src/opnsense/mvc/app/views/layouts/default.volt

@@ -231,7 +231,7 @@
     </div>
 
         <!-- page footer -->
-    <footer class="page-foot col-sm-push-2">
+    <footer class="page-foot col-sm-push-3 col-lg-push-2">
       <div class="container-fluid">
         <a target="_blank" href="https://opnsense.org/" class="redlnk">OPNsense</a> (c) 2014-2016 <a href="https://www.deciso.com" class="tblnk">Deciso B.V.</a>
       </div>

src/www/foot.inc

 
-      <footer class="page-foot col-sm-push-2">
+      <footer class="page-foot col-sm-push-3 col-lg-push-2">
         <div class="container-fluid">
           <a target="_blank" href="<?=$g['product_website']?>" class="redlnk"><?=$g['product_name']?></a> (c)
             <?=$g['product_copyright_years']?> <a href="<?=$g['product_copyright_url']?>" class="tblnk"><?=$g['product_copyright_owner']?></a>