Fix VTY syntax for newly-introduced NS2 timers

In I00e9023a6e7adc6ad48f4016fcaef189ac8b353e we introduced two new
"timers": Number of retries for SNS-CONFIG and for SNS-SIZE.

Yet, the VTY syntax only added one string (tsns-prov-retires), probably
dating back to an earlier version.

Change-Id: I25fa579c7d68a8e4cb1175ae2245f009ab40fda7
diff --git a/src/gb/gprs_ns2_internal.h b/src/gb/gprs_ns2_internal.h
index 9e63c70..df3772a 100644
--- a/src/gb/gprs_ns2_internal.h
+++ b/src/gb/gprs_ns2_internal.h
@@ -16,7 +16,7 @@
 struct gprs_ns2_vc_bind;
 
 #define NS_TIMERS_COUNT 10
-#define NS_TIMERS "(tns-block|tns-block-retries|tns-reset|tns-reset-retries|tns-test|tns-alive|tns-alive-retries|tsns-prov|tsns-prov-retries)"
+#define NS_TIMERS "(tns-block|tns-block-retries|tns-reset|tns-reset-retries|tns-test|tns-alive|tns-alive-retries|tsns-prov|tsns-size-retries|tsns-config-retries)"
 #define NS_TIMERS_HELP	\
 	"(un)blocking Timer (Tns-block) timeout\n"		\
 	"(un)blocking Timer (Tns-block) number of retries\n"	\