added switch to control the webapp function

app/views/manifest/index.json.erb

@@ -1,3 +1,4 @@
+<% if Setting.plugin_baupm_core['baupm_enable_webapp'] == 1 %>
 {
   "name": "<%= Setting.plugin_baupm_core['baupm_application_title'] %>",
   <% if Setting.plugin_baupm_core['baupm_application_short_title'].present? %>
@@ -39,3 +40,4 @@
     }
   ]
 }
+<% end %>