Deleting that line seemed to fix things for a while, but I'm having numerous other problems trying to get the Android version running with Resilio Sync -- I suspect it's essentially this issue
The Linux versions sync well with Resilio Sync -- for those of us trying to get away from commercial services, Resilio (which used to be called Syncthing) is a great solution, it uses BitTorrent to sync directories.
This morning I tried to see if I could get Joplin/Android working with Dropbox, but failed, unfortunately. If there is a recommended way to get this working, I'd be happy to try it.