tests: Set print_category values explicitly

This will alow easily changing default values for print_category vs
print_category_hex later.

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.

Related: OS#5034
Change-Id: If29b40557d5c2bcda04b964f344070bad58d8f28
diff --git a/tests/logging/logging_test.c b/tests/logging/logging_test.c
index b9cb57f..d036dc5 100644
--- a/tests/logging/logging_test.c
+++ b/tests/logging/logging_test.c
@@ -78,6 +78,7 @@
 	log_add_target(stderr_target);
 	log_set_all_filter(stderr_target, 1);
 	log_set_print_filename(stderr_target, 0);
+	log_set_print_category_hex(stderr_target, 0);
 	log_set_print_category(stderr_target, 1);
 	log_set_use_color(stderr_target, 0);