lib: cmsis_rtos_v1: replace an else case

Replace an else-if case in osSemaphoreWait with
else to account for both EBUSY and EAGAIN return
values from k_sem_take. The return value would be
0 for osSemaphoreWait in both cases.

Signed-off-by: Niranjhana N <niranjhana.n@intel.com>