fix BSC_Tests_LCLS: do not use t_def_TestHdlrPars directly

As stated in the comment near the t_def_TestHdlrPars definition,
valueof() shall not be used for getting a value of this template.
The f_gen_test_hdlr_pars() function should be used instead.

All LCLS testcases violated this, and started to fail since
recently after patch [1] has been merged:

  "MSC_ConnectionHandler.ttcn:820 : Either imsi or imei must be set!"
      BSC_Tests_LCLS.ttcn:743 BSC_Tests_LCLS control part
      BSC_Tests_LCLS.ttcn:262 TC_lcls_gcr_only testcase

Use f_gen_test_hdlr_pars() as suggested.

Change-Id: I69ab8699b0be80b12e2df590d9170a743a00d035
Fixes: [1] b27653c6b60d49de5e67dfffb876d1a8b7091ff2
diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index c0a64a9..a9d7c9d 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -22,6 +22,7 @@
 
 friend module BSC_Tests_VAMOS;
 friend module BSC_Tests_CBSP;
+friend module BSC_Tests_LCLS;
 
 import from Misc_Helpers all;
 import from General_Types all;