tests: benchmarks: multicore: idle_outside_of_main: adjust test fun

Test function specific for this code.

Signed-off-by: Piotr Kosycarz <[email protected]>

Author: nordic-piks

tests/benchmarks/multicore/idle_outside_of_main/testcase.yaml

@@ -14,4 +14,4 @@ tests:
     harness_config:
       fixture: ppk_power_measure
       pytest_root:
-        - "${CUSTOM_ROOT_TEST_DIR}/test_measure_power_consumption.py::test_measure_and_data_dump_power_consumption_simple"
+        - "${CUSTOM_ROOT_TEST_DIR}/test_measure_power_consumption.py::test_measure_and_data_dump_power_consumption_s2ram_outside_of_main"