Clean up folder panel (...) (fixes #964)

- Remove ID
- Hide "Out of sync" when in sync
- Hide "Folder master" when default (not master)
- Hide "Ignore permissions" when default (not ignored)
- Hide "Rescan interval" when default (60 seconds)
Clean up device panel (...) (ref #964)

- Remove "Synchronization"
- Hide "Compression" when default (on)
- Hide "Introducer" when default (off)