Remove support for backing up to Aedict Online #749
Description
The backup works in a brutal way: it basically deletes everything you have in Aedict Online, and replaces it with your phone settings. This is totally incompatible with the EmbeddedDB mode (since EmbeddedDB mode uses proper entry-by-entry synchronization instead of this brutal overwrite). It basically recreates all of your data, but with new row IDs, and the EmbeddedDB synchronization engine is not happy about that :-)