tests: Explicitly drop category from log

Let's disable category here since we don't care about its formatting here.

In any case, every test relying on logging output validation should
always explicitly state the config to avoid issues in the future if
default values change.

Change-Id: Iaa77f8a7d3f752173507afd988bd76a8aa632082
Related: OS#5034
diff --git a/tests/CommonLibs/LogTest.cpp b/tests/CommonLibs/LogTest.cpp
index 0087070..973e5b2 100644
--- a/tests/CommonLibs/LogTest.cpp
+++ b/tests/CommonLibs/LogTest.cpp
@@ -61,6 +61,8 @@
 	log_set_use_color(osmo_stderr_target, 0);
 	log_set_print_filename(osmo_stderr_target, 0);
 	log_set_print_level(osmo_stderr_target, 1);
+	log_set_print_category(osmo_stderr_target, 0);
+	log_set_print_category_hex(osmo_stderr_target, 0);
 
 	Log(MYCAT, LOGL_FATAL, __BASE_FILE__, __LINE__).get() << "testing the logger.";
 	Log(MYCAT, LOGL_ERROR, __BASE_FILE__, __LINE__).get() << "testing the logger.";