Let instructor configure

Author: runestonetest

runestone/common/project_template/_templates/plugin_layouts/sphinx_bootstrap/layout.html

@@ -259,6 +259,7 @@
     eBookConfig.username = '{{= user_id}}';
     eBookConfig.readings = {{= readings}};
     eBookConfig.activities = {{= XML(activity_info) }}
+    eBookConfig.downloadsEnabled = {{=downloads_enabled}};
     eBookConfig.allow_pairs = {{=allow_pairs}}
     {% endraw %}
   {% else %}
@@ -279,7 +280,6 @@
   eBookConfig.jobehost = '{{jobe_server}}';
   eBookConfig.proxyuri_runs = '{{proxy_uri_runs}}';
   eBookConfig.proxyuri_files = '{{proxy_uri_files}}';
-  eBookConfig.downloadsEnabled = {{downloads_enabled}};
   eBookConfig.enable_chatcodes = {{enable_chatcodes}} ? {{ enable_chatcodes }} : false;