package/pulseaudio: remove kde files

Upstream removed the src/daemon/pulseaudio-kde.desktop.in since the
version 6.0 [1].

[1] https://github.com/pulseaudio/pulseaudio/commit/f46799579f438125b695dced4edf8bca05cbe90a



Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>