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>

DEVELOPERS

@@ -430,7 +430,6 @@ F:	package/libglu/
 F:	package/libhdhomerun/
 F:	package/libheif/
 F:	package/libilbc/
-F:	package/libks/
 F:	package/libldns/
 F:	package/libmicrohttpd/
 F:	package/libminiupnpc/