Add missing closing tag for link in site header

Firefox was showing the source code with the heading tags in red.
I discovered that it was due to a missing link-closing tag, so I
added </a> to the main layout heading.

views/layout.erb

@@ -64,7 +64,7 @@
                         <a href="/"><span class="header-logo">EveryPolitician</span></a>
                       <% end %>
                     </h2>
-                    <% if @house %><h3><a href="/<%= @country.slug.downcase %>/<%= @house.slug.downcase %>/"><%= @house.name %></h3><% end %>
+                    <% if @house %><h3><a href="/<%= @country.slug.downcase %>/<%= @house.slug.downcase %>/"><%= @house.name %></a></h3><% end %>
                 </div>
                 <div class="site-header__navigation site-header__navigation--primary">
                     <nav role="navigation">