Allow AllApps to restore current selected tab on activity recreate

This CL also fixes:

- Wrong tab selection on RTL
- Fixes header protection hydraulic scroll issue
- Work toggle button text background contrast

Bug: 186005219
Bug: 191250799
Bug: 191227662
Bug: 191349226
Test: Manual
Change-Id: I3777474c954ed0d542ac38ff552367904be147d3

src/com/android/launcher3/allapps/WorkModeSwitch.java

@@ -67,6 +67,7 @@ public class WorkModeSwitch extends Button implements Insettable, View.OnClickLi
     @Override
     protected void onFinishInflate() {
         super.onFinishInflate();
+        setSelected(true);
         setOnClickListener(this);
         if (Utilities.ATLEAST_R) {
             mKeyboardInsetAnimationCallback = new KeyboardInsetAnimationCallback(this);