spotify: Remove unused wait_on-function
spotify: Remove unused wait_on-function

It'll be easy enough to re-add if/when it's needed.

Signed-off-by: Anton Lofgren <644ec9b400317727ea69122efab4ea2fa19fba46@gmail.com>

catharsis/spotifile,chelmertz/spotifile,catharsis/spotifile,chelmertz/spotifile,raoulh/spotifile,raoulh/spotifile,chelmertz/spotifile,raoulh/spotifile,catharsis/spotifile