[sim] HAL_GetControlWord: Fully zero output (#2873)

This ensures the padding is zero'ed.  We already do this on Athena, we just didn't in sim.

hal/src/main/native/cpp/jni/HAL.cpp

@@ -172,7 +172,6 @@ Java_edu_wpi_first_hal_HAL_nativeGetControlWord
   static_assert(sizeof(HAL_ControlWord) == sizeof(jint),
                 "Java int must match the size of control word");
   HAL_ControlWord controlWord;
-  std::memset(&controlWord, 0, sizeof(HAL_ControlWord));
   HAL_GetControlWord(&controlWord);
   jint retVal = 0;
   std::memcpy(&retVal, &controlWord, sizeof(HAL_ControlWord));