Some bluetooth keyboards have only 5 rows of keys, so the top row has the:
1-9, 0, -, + keys. These not only double as function keys using Fn + key,
but also as media-keys, e.g. next/prev song, using Ctrl + Fn + key.

Unfortunately the firmware for these keyboards is somewhat buggy and when
sending media keys they send along the Ctrl modifier, so we receive e.g.
"Ctrl + next-song" this commit adds bindings for Ctrl + media-key for the
media-keycodes send by these keyboards, so that these work as expected.