fix hiding signup button when registration is disabled

server/views/partials/auth/form.hbs

@@ -28,6 +28,7 @@
       <span>{{> icons/spinner}}</span>
       Log in
     </button>
+    {{#unless disallow_registration}}
       <button 
         type="button"
         class="secondary signup" 
@@ -44,6 +45,7 @@
           <span>{{> icons/spinner}}</span>
           Sign up
       </button>
+    {{/unless}}
   </div>
   <a class="forgot-password" href="/reset-password" title="Reset password">Forgot your password?</a>
   {{#unless errors}}