passenger: fix root directive in apache config.

Otherwise, Passenger will fail to load, since it can't find the required
agents, like PassengerWatchdog

Closes #22651.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
ssh-copy-id 6.3p1

Closes #22652.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>