[Offload] Temporarily disable failing test after eb88e7c1

The `target reduction` combination is no longer accepted.
Disable the test to avoid build failures, until a better fix is ready.

offload/test/api/omp_device_memory.c

@@ -15,7 +15,7 @@ int main() {
   }
 
   int sum = 0;
-#pragma omp target reduction(+ : sum) is_device_ptr(device_ptr)
+//#pragma omp target reduction(+ : sum) is_device_ptr(device_ptr)
   for (int i = 0; i < N; ++i)
     sum += device_ptr[i];