srsue.conf.tmpl: fix the configuration of UE params for carrier aggregation

the num_carriers is parsed as a string in the conf dict and therefore
needs to converted to int before matching

also changed the num_carriers to be of type UINT

Change-Id: I1386812d32e1181ba666720bbb875bf9bbce0f51
diff --git a/src/osmo_gsm_tester/templates/srsue.conf.tmpl b/src/osmo_gsm_tester/templates/srsue.conf.tmpl
index 90925b3..d97b00c 100644
--- a/src/osmo_gsm_tester/templates/srsue.conf.tmpl
+++ b/src/osmo_gsm_tester/templates/srsue.conf.tmpl
@@ -31,7 +31,7 @@
 #                     Default is auto (yes for UHD, no for rest)
 #####################################################################
 [rf]
-% if ue.num_carriers == 2:
+% if int(ue.num_carriers) == 2:
 dl_earfcn = 2850,3050
 % else:
 dl_earfcn = 2850
@@ -143,7 +143,7 @@
 # mbms_service_port: Port of the MBMS service
 #####################################################################
 [rrc]
-% if ue.num_carriers == 2:
+% if int(ue.num_carriers) == 2:
 ue_category       = 7
 release           = 10
 % else: