DEVELOPERS: remove Bernd Kuhls from libks

I am not using this package anymore.

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit c79ec67bc8763f8d630f51ffbcaf0bb6bfb71236)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -411,7 +411,6 @@ F:	package/libglu/
 F:	package/libhdhomerun/
 F:	package/libheif/
 F:	package/libilbc/
-F:	package/libks/
 F:	package/libldns/
 F:	package/libmicrohttpd/
 F:	package/libminiupnpc/