ftmod_libpri: Default disable NT-mode idle b-channel restart

Some people, it seems, were having sleepless nights from the
log messages this feature produces every 15 minutes.

Default disable the feature, because i hate repeating myself
over and over, explaining them this is a non-issue and intended
behaviour and how to disable it in the config.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

libs/freetdm/src/ftmod/ftmod_libpri/ftmod_libpri.h

@@ -41,7 +41,7 @@
 #define OVERLAP_TIMEOUT_MS_MAX		30000	/* 30 sec */
 
 /* NT-mode idle b-channel restart timer */
-#define IDLE_RESTART_TIMEOUT_MS_DEFAULT	900000		/* 15 min */
+#define IDLE_RESTART_TIMEOUT_MS_DEFAULT	0		/* disabled */
 #define IDLE_RESTART_TIMEOUT_MS_MIN	10000		/* 10 sec */
 #define IDLE_RESTART_TIMEOUT_MS_MAX	86400000	/* 1 day */