units/fedora: let rc-local.service log to syslog

rc-local.service should not be excluded from the default stdout logging.

Missing logs were noticed by Andrew McNabb in
 https://bugzilla.redhat.com/show_bug.cgi?id=750032#c3

units/fedora/rc-local.service

@@ -13,6 +13,5 @@ ConditionFileIsExecutable=/etc/rc.d/rc.local
 Type=forking
 ExecStart=/etc/rc.d/rc.local start
 TimeoutSec=0
-StandardOutput=tty
 RemainAfterExit=yes
 SysVStartPriority=99