[Fixed] Reverse scrolling setting is reversed

If useTouchpadNaturalScrolling is false, "Reverse scrolling" should be on.

[The API value]
useTouchpadNaturalScrolling: false

[The expected UX behavior]
Reverse scrolling: on
fingers upward, scroll up, content moves down

The description of "useTouchpadNaturalScrolling":
Returns true if moving two fingers upwards on the touchpad should scroll down, which is known as natural scrolling.

The description of "Reverse scrolling":
Content moves up when you scroll down.

Bug: 280047007
Test: manual and passed atest TrackpadReverseScrollingPreferenceControllerTest
Change-Id: Ia5e30fa14b599ddcffae99005114f10412ccad3c

src/com/android/settings/inputmethod/TrackpadReverseScrollingPreferenceController.java

@@ -30,12 +30,12 @@ public class TrackpadReverseScrollingPreferenceController extends TogglePreferen
 
     @Override
     public boolean isChecked() {
-        return InputSettings.useTouchpadNaturalScrolling(mContext);
+        return !InputSettings.useTouchpadNaturalScrolling(mContext);
     }
 
     @Override
     public boolean setChecked(boolean isChecked) {
-        InputSettings.setTouchpadNaturalScrolling(mContext, isChecked);
+        InputSettings.setTouchpadNaturalScrolling(mContext, !isChecked);
         return true;
     }