tests: Report driver bugs with a clearer name

Calling them "driver bugs" is clearer than just "bugs", especially since
another category is called "failures".

Author: LingMan

include/private/vkd3d_test.h

@@ -320,7 +320,7 @@ int main(int argc, char **argv)
 
     vkd3d_test_main(argc, argv);
 
-    printf("%s: %lu tests executed (%lu failures, %lu successful todo, %lu skipped, %lu todo, %lu bugs, %lu fixed bugs).\n",
+    printf("%s: %lu tests executed (%lu failures, %lu successful todo, %lu skipped, %lu todo, %lu driver bugs, %lu fixed driver bugs).\n",
             vkd3d_test_name,
             (unsigned long)(vkd3d_test_state.success_count
             + vkd3d_test_state.failure_count