[FrameworkBundle] Don't hide logs by default in exception pages

src/Symfony/Bundle/FrameworkBundle/Resources/views/Exception/exception.html.twig

@@ -51,8 +51,8 @@
                 <h2>
                     Logs&nbsp;
                     <a href="#" onclick="toggle('logs'); switchIcons('icon_logs_open', 'icon_logs_close'); return false;">
-                        <img class="toggle" id="icon_logs_close" alt="-" src="{{ asset('bundles/framework/images/blue_picto_less.gif') }}" style="visibility: hidden" />
-                        <img class="toggle" id="icon_logs_open" alt="+" src="{{ asset('bundles/framework/images/blue_picto_more.gif') }}" style="visibility: display; margin-left: -18px" />
+                        <img class="toggle" id="icon_logs_open" alt="+" src="{{ asset('bundles/framework/images/blue_picto_more.gif') }}" style="visibility: hidden" />
+                        <img class="toggle" id="icon_logs_close" alt="-" src="{{ asset('bundles/framework/images/blue_picto_less.gif') }}" style="visibility: display; margin-left: -18px" />
                     </a>
                 </h2>
                 {% endspaceless %}
@@ -67,7 +67,7 @@
 
             </div>
 
-            <div id="logs" style="display: none">
+            <div id="logs">
                 {% include 'FrameworkBundle:Exception:logs.html.twig' with { 'logs': logger.logs } only %}
             </div>