Reorder and clean up imports.

Test: rebuild
Change-Id: I178485c84ae7146f991fd77b6d7504b029942a68

src/com/android/settings/display/NightDisplaySettings.java

@@ -21,7 +21,6 @@ import android.app.TimePickerDialog;
 import android.content.Context;
 import android.os.Bundle;
 import android.provider.SearchIndexableResource;
-import androidx.preference.Preference;
 
 import com.android.internal.app.ColorDisplayController;
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
@@ -36,6 +35,8 @@ import java.time.LocalTime;
 import java.util.ArrayList;
 import java.util.List;
 
+import androidx.preference.Preference;
+
 /**
  * Settings screen for Night display.
  */