package/transmission: remove BR2_PACKAGE_TRANSMISSION_REMOTE

Commit 6e223241 ("Add Transmission
package"), which added the transmission package, introduced a
BR2_PACKAGE_TRANSMISSION_REMOTE Config.in option, supposedly matching
the --enable-remote/--disable-remote transmission option.

However, transmission as of version 2.33 packaged by this initial
commit, did not have a --enable-remote/--disable-remote option, and it
was apparently never part of transmission.

Therefore, this commit removes this useless option. Since the
transmission-remote tool is automatically built when the daemon is
enabled, the Config.in.legacy handling selects
BR2_PACKAGE_TRANSMISSION_DAEMON.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>