Theme: Vertical align theme select in configure

Fixes #807

tpl/default/configure.html

@@ -55,7 +55,7 @@ <h2 class="window-title">{'Configure'|t}</h2>
         </div>
         <div class="pure-u-lg-{$ratioInput} pure-u-1">
           <div class="form-input">
-            <select name="theme" id="theme">
+            <select name="theme" id="theme" class="align">
               {loop="$theme_available"}
                 <option value="{$value}"
                   {if="$value===$theme"}

tpl/default/css/shaarli.css

@@ -832,6 +832,7 @@ pre {
 
 .page-form-complete .form-label label,
 .page-form-complete .form-input input,
+.page-form-complete .form-input select.align,
 .page-form-complete .timezone {
     position: absolute;
     top: 50%;