tests: thread_error_case: fix incorrect userspace filtering

The filter here should be used to filter for capability:
whether the platform configuration supports userspace. And if
it does support userspace, we then enable CONFIG_TEST_USERSPACE
(and thus CONFIG_USERSPACE) for testing. We should not be
filtering for whether userspace is enabled, but should really
be filtering for whether userspace is supported.

Signed-off-by: Daniel Leung <[email protected]>

Author: dcpleung

tests/kernel/threads/thread_error_case/testcase.yaml

@@ -4,7 +4,7 @@ tests:
       - kernel
       - threads
       - userspace
-    filter: CONFIG_USERSPACE
+    filter: CONFIG_ARCH_HAS_USERSPACE
     ignore_faults: true
     integration_platforms:
       - qemu_x86