Use local mSensors as index of mSensors list

The mDevicePosture was the index use for TriggerSensor[]
In this bug, the onTrigger(TriggerEvent event) has call to
corresponding TriggerSensor and local mSensors should
maping the index of mPosure.

Test: atest DozeSensorsTest
Bug: 203822366
Change-Id: I7baa1c8d971b2f0be78792810260859cd60f1fab

packages/SystemUI/src/com/android/systemui/doze/DozeSensors.java

@@ -659,7 +659,7 @@ public class DozeSensors {
         @Override
         @AnyThread
         public void onTrigger(TriggerEvent event) {
-            final Sensor sensor = mSensors[mDevicePosture];
+            final Sensor sensor = mSensors[mPosture];
             mDozeLog.traceSensor(mPulseReason);
             mHandler.post(mWakeLock.wrap(() -> {
                 if (DEBUG) Log.d(TAG, "onTrigger: " + triggerEventToString(event));