Update key visual changes for one handed mode settings

Follow new visual UI to change the design.

Bug: 175851783
Bug: 188868459
Bug: 189001678

Test: manual verified on Settings > System > Gesture page
> System controls page
Test: make RunSettingsRoboTests ROBOTEST_FILTER=
      "com.android.settings.gestures
      .OneHandedEnablePreferenceControllerTest"
Test: make RunSettingsRoboTests ROBOTEST_FILTER=
      "com.android.settings.gestures
      .OneHandedMainSwitchPreferenceControllerTest"
Test: make RunSettingsRoboTests ROBOTEST_FILTER=
      "com.android.settings.gestures
      .OneHandedActionPullDownPrefControllerTest"
Test: make RunSettingsRoboTests ROBOTEST_FILTER=
      "com.android.settings.gestures
      .OneHandedActionShowNotificationPrefControllerTest"

Change-Id: I86535fd9f49726c7234353032b950640346a02c5