Fix extension configs meta page to correctly handle multiple instance extensions like blog

middleman-core/lib/middleman-core/meta_pages/templates/config.html.erb

@@ -14,7 +14,7 @@
     <h1>Middleman Configuration</h1>
 
     <p>This page shows the current configuration of your Middleman application.</p>
-    
+
     <p>
       <a href="#core">Core configuration</a>
       | <a href="#extensions">Extensions</a>
@@ -32,10 +32,10 @@
       <% extension_config.each do |ext_name, configs| %>
       <li>
         <% registered_extensions.delete(ext_name) %>
-        
-        <span class="extension active"><%= ext_name.inspect %></span>
 
-        
+        <span class="extension active">:<%= ext_name %></span>
+
+
         <% if configs && !configs.empty? %>
         <ul class="settings">
           <% configs.each do |setting| %>
@@ -55,5 +55,3 @@
     </div>
   </body>
 </html>
-
-