bts: no need to import GSM_RR_Types twice

Change-Id: Ie3c45df74baebfefb36e09a27b820093f7b9218b
diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 5f71538..1044747 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -5,7 +5,6 @@
 import from GSM_RR_Types all;
 import from Osmocom_Types all;
 import from GSM_Types all;
-import from GSM_RR_Types all;
 import from GSM_SystemInformation all;
 import from L1CTL_PortType all;
 import from L1CTL_Types all;