qemu-char.c: fix waiting for telnet connection message

qemu-char.c: fix waiting for telnet connection message

Current colon position in "waiting for telnet connection" message template
produces messages like:
QEMU waiting for connection on: telnet::127.0.0.16666,server

After moving a colon to the right, we will get a correct messages like:
QEMU waiting for connection on: telnet:127.0.0.1:6666,server

Signed-off-by: Igor Mitsyanko <i.mitsyanko@gmail.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit e5545854dd1e2e3507b210ac0c1cbfca69ff0fcb)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>