Test: Fix text coloring not respecting default

Change-Id: I5d63b1d4c4d404c7293cecd279ac6101db26768f
Signed-off-by: Raef Coles <raef.coles@arm.com>
diff --git a/test/framework/test_framework_helpers.c b/test/framework/test_framework_helpers.c
index 5341058..46f7171 100644
--- a/test/framework/test_framework_helpers.c
+++ b/test/framework/test_framework_helpers.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2020, Arm Limited. All rights reserved.
+ * Copyright (c) 2017-2021, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  *
@@ -36,5 +36,5 @@
 
 void printf_set_color(enum serial_color_t color_id)
 {
-    TEST_LOG("\33[3%dm", color_id);
+    TEST_LOG("\33[%dm", color_id);
 }