TriggerTest: Make sure LumiBlockMuWriter is enabled where needed.

Enable LumiBlockMuWriter in testLVL1CTPAthenaTrigRDO.py.

Trigger/TrigValidation/TriggerTest/share/testLVL1CTPAthenaTrigRDO.py

@@ -65,6 +65,9 @@ GenerateMenu.overwriteSignaturesWith(L1Only)
 include("RecExCommon/RecExCommon_topOptions.py")
 #-----------------------------------------------------------
 
+from LumiBlockComps.LumiBlockMuWriterDefault import LumiBlockMuWriterDefault
+LumiBlockMuWriterDefault()
+
 #------------------------------------------------------------
 include("TriggerTest/TriggerTestCommon.py")
 #------------------------------------------------------------