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: I7f9c56313cfaa74ebe666f44763a83d8102f5484
Related: OS#5034
diff --git a/tests/edge/EdgeTest.cpp b/tests/edge/EdgeTest.cpp
index 6161e0e..8536cfc 100644
--- a/tests/edge/EdgeTest.cpp
+++ b/tests/edge/EdgeTest.cpp
@@ -1396,6 +1396,8 @@
 	osmo_init_logging2(tall_pcu_ctx, &gprs_log_info);
 	log_set_use_color(osmo_stderr_target, 0);
 	log_set_print_filename(osmo_stderr_target, 0);
+	log_set_print_category(osmo_stderr_target, 0);
+	log_set_print_category_hex(osmo_stderr_target, 0);
 
 	the_pcu = gprs_pcu_alloc(tall_pcu_ctx);