Update nav button color when nav button layout changes

Bug: 288311605
Test: Rotate the screen in small screen, make sure the button colors are correct
Change-Id: I36ae980fbe239ea4e1ebb63200ee876b690cf218

quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java

@@ -736,6 +736,7 @@ public class NavbarButtonsViewController implements TaskbarControllers.LoggableT
                             dp, mNavButtonsView, res, isInKidsMode, isInSetup, isThreeButtonNav,
                             TaskbarManager.isPhoneMode(dp), mDisplayController.getInfo().rotation);
             navButtonLayoutter.layoutButtons(dp, isContextualButtonShowing());
+            updateNavButtonColor();
             return;
         }