[firebird-support] Linux init script fix

[Rick Debay]

https://bugzilla.redhat.com/show_bug.cgi?id=886578

The file /etc/init.d/firebird-superclassic was incorrect.  We (James
Calfee) reported a bug against the EPEL firebird-superclassic.x86_64
package and Redhat patched it.