package/transmission: fix sysv init script (name vs. exec)

package/transmission: fix sysv init script (name vs. exec)

With the start-stop-daemon enabled (instead of the busybox applet),
stopping transmission emits spurious warnings:

  $ /etc/init.d/S92transmission stop
  Stopping bittorrent client transmission-daemon...
  start-stop-daemon: warning: this system is not able to track process names
  longer than 15 characters, please use --exec instead of --name.

Update our startup script to match what was done upstream 9 years ago:
    https://trac.transmissionbt.com/ticket/4724
    https://trac.transmissionbt.com/wiki/Scripts/initd?action=diff&version=24&old_version=23

Partially fixes:
  - https://bugs.busybox.net/show_bug.cgi?id=13576

Reported-by: ingineru_de_sistem@yahoo.com
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
[yann.morin.1998@free.fr:
  - reword commit log
  - add reference to upstream ticket and changeset
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>