library/PCUIF_Types: fix wrong parameter type in ts_PCUIF_DATA_IND

The 'lqual_cb' represents the link quality in centiBels, which
can be negative.  Use 'int16_t' instead of 'uint16_t'.

Change-Id: I038eec22928d831ddbc0a2704830d5e2eab2cb6b
diff --git a/library/PCUIF_Types.ttcn b/library/PCUIF_Types.ttcn
index b259cfc..9d6b023 100644
--- a/library/PCUIF_Types.ttcn
+++ b/library/PCUIF_Types.ttcn
@@ -438,7 +438,7 @@
 						 template (value) int8_t rssi := -80,
 						 template (value) uint16_t ber10k := 0,
 						 template (value) int16_t ta_offs_qbits := 0,
-						 template (value) uint16_t lqual_cb := 10) := {
+						 template (value) int16_t lqual_cb := 10) := {
 	msg_type := PCU_IF_MSG_DATA_IND,
 	bts_nr := bts_nr,
 	spare := '0000'O,