Show content for cookies_disabled and unsupported_dialog on mobile devices.

* This is still not pretty, but it is a safe for hotfix into staging. This makes the unsupported dialog and cookies disabled screens look equivalent to the current prod.

cherry picked from the stage hotfix - 977706bc288660a5b40c5ea58001fc9bba4fda90

resources/static/dialog/css/m.css

@@ -196,5 +196,13 @@
   .inputs > li {
     margin-top: 12px;
   }
+
+  /* The unsupported and cookies_disabled dialogs have to be position: static
+   * or else their content is not displayed on mobile devices. See issue #1998
+   */
+  #error.unsupported, #error.cookies_disabled {
+    position: static;
+    height: 250px;
+  }
 }