remove *.default from [EXECUTE] in *.default files

The problem is that the .cfg file cannot override the [EXECUTE]
provided list of tests

Change-Id: I7e1e0499b3b32014b25ae4b515263f57a4ea6daf
diff --git a/ggsn_tests/GGSN_Tests.cfg b/ggsn_tests/GGSN_Tests.cfg
index b7c0988..e849ed4 100644
--- a/ggsn_tests/GGSN_Tests.cfg
+++ b/ggsn_tests/GGSN_Tests.cfg
@@ -15,3 +15,4 @@
 [MODULE_PARAMETERS]
 
 [EXECUTE]
+GGSN_Tests.control