Fix: T3192 and T3193 must be similar

In order to keep mobile at PACCH as long as possible the timer T3192 is
set to 1500ms. This reduces the probablity of long lasting assignment
process on CCCH for subsequent downlink TBFs.
diff --git a/openbsc/src/libbsc/bts_ipaccess_nanobts.c b/openbsc/src/libbsc/bts_ipaccess_nanobts.c
index bc246f1..86c9fdc 100644
--- a/openbsc/src/libbsc/bts_ipaccess_nanobts.c
+++ b/openbsc/src/libbsc/bts_ipaccess_nanobts.c
@@ -157,7 +157,7 @@
 		20, 	/* T3142 */
 		5, 	/* T3169 */
 		5,	/* T3191 */
-		200,	/* T3193 (units of 10ms) */
+		160,	/* T3193 (units of 10ms) */
 		5,	/* T3195 */
 		10,	/* N3101 */
 		4,	/* N3103 */