Fix unnecessary header prefix in tests

Remove unnecessary "../library" prefix from test suite include. This
aligns the test suite with the development branch

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/tests/suites/test_suite_psa_its.function b/tests/suites/test_suite_psa_its.function
index 7864b9c..2f8b8f9 100644
--- a/tests/suites/test_suite_psa_its.function
+++ b/tests/suites/test_suite_psa_its.function
@@ -10,7 +10,7 @@
  * before changing how test data is constructed or validated.
  */
 
-#include "../library/psa_crypto_its.h"
+#include "psa_crypto_its.h"
 
 #include "test/psa_helpers.h"