Include backup/restore as advanced.
Include backup/restore as advanced.

Follow on from #2750.

Specifically, the backup/restore functionality should be part of
"Advanced options".

gdh1995/vimium,smblott-github/vimium,smblott-github/vimium,gdh1995/vimium,smblott-github/vimium,philc/vimium,poacher2k/vimium,gdh1995/vimium,decaffeinate-examples/vimium,poacher2k/vimium,philc/vimium,decaffeinate-examples/vimium,decaffeinate-examples/vimium,philc/vimium,poacher2k/vimium