tests: cmake: fix identifier

config_dir is part of cmake testsuite.

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

tests/cmake/config_dir/testcase.yaml

@@ -1,5 +1,5 @@
 tests:
-  config_dir.user_defined:
+  cmake.config_dir.user_defined:
     platform_allow: native_posix
     build_only: true
     extra_args: APPLICATION_CONFIG_DIR:PATH=foo