tests/misc/check_init_priorities: Fix integration_platforms list

Fix what seems like a silly mistake in the integration
platforms list.

Signed-off-by: Alberto Escolar Piedras <[email protected]>

Author: aescolar

tests/misc/check_init_priorities/testcase.yaml

@@ -9,4 +9,4 @@ tests:
       - native_posix
     integration_platforms:
       - native_sim
-      - native_sim
+      - native_sim/native/64