Fix some minor mistakes.

src/static/css/pad.css

@@ -402,7 +402,6 @@ table#otheruserstable {
   font-style: italic;
 }
 
-#connectivitylink,
 #connectivity {
   z-index: 600 !important;
 }

src/templates/pad.html

@@ -221,7 +221,7 @@
         <div id="connectivity" class="popup">
             <% e.begin_block("modals"); %>
                 <div class="connected visible">
-                  <h2>Connected.<h2>
+                  <h2>Connected.</h2>
                 </div>
                 <div class="reconnecting">
                   <h2>Reestablishing connection...</h2>