[FrameworkBundle] Fixed css

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

@@ -52,7 +52,7 @@
                     Logs 
                     <a href="#" onclick="toggle('logs'); switchIcons('icon_logs_open', 'icon_logs_close'); return false;">
                         <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" />
+                        <img class="toggle" id="icon_logs_close" alt="-" src="{{ asset('bundles/framework/images/blue_picto_less.gif') }}" style="visibility: visible; margin-left: -18px" />
                     </a>
                 </h2>
                 {% endspaceless %}
@@ -81,7 +81,7 @@
                 Content of the Output&nbsp;
                 <a href="#" onclick="toggle('output_content'); switchIcons('icon_content_open', 'icon_content_close'); return false;">
                     <img class="toggle" id="icon_content_close" alt="-" src="{{ asset('bundles/framework/images/blue_picto_less.gif') }}" style="visibility: hidden" />
-                    <img class="toggle" id="icon_content_open" alt="+" src="{{ asset('bundles/framework/images/blue_picto_more.gif') }}" style="visibility: display; margin-left: -18px" />
+                    <img class="toggle" id="icon_content_open" alt="+" src="{{ asset('bundles/framework/images/blue_picto_more.gif') }}" style="visibility: visible; margin-left: -18px" />
                 </a>
             </h2>
             {% endspaceless %}