tests: kernel: Change a mbox testcase that condition unsuitable
tests: kernel: Change a mbox testcase that condition unsuitable

Fix issue #33114 #33120. Modify the testcase that run failed on iotdk
and nsim. This testing do not need receive thread ID when invoke
k_mbox_data_get() with NULL param. The testcase purpose is invoke
this API with NULL buffer and NULL receive_id. It will cause fatal
error if use a uninitialize receive id.

Signed-off-by: Jian Kang <bbfd55c7680e868b620cbd6ca6d44587e496037e@intel.com>

finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,galak/zephyr,galak/zephyr,galak/zephyr,Vudentz/zephyr,nashif/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,nashif/zephyr,nashif/zephyr,galak/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,Vudentz/zephyr