Fix: sbd-inquisitor: Enable pacemaker integration by default as advertised in sysconfig.sbd

"Default: yes" for SBD_PACEMAKER has always been advertised in
the example sbd.sysconfig. This commit is to ensure that's true again.
It can be disabled by either explicitly setting SBD_PACEMAKER=no in
sysconfig or supplying "-P" option twice like "-P -P".