Tuning playback speed is usually done through multiple actions (because
values are relative/increments). It is better to create a tear-off menu
from it. Especially true since status bar isn't enabled by default.
(cherry picked from commit 88515f20012beb82028e1fd1fbf2f015d0042b23)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>