Add margin to SUW back button

* navButtonsLayoutParams marginEnd was removed, and
SUW was relying on that value to add margins to
SUW back button, but was returning 0.

Fixes: 242999939
Test: Visually observed in SUW test activity
adb shell am start -n com.google.android.setupwizard/.SetupWizardTestActivity

Change-Id: I5ffc421e9b731b0d9c7b7c48eab807d4419721b1
diff --git a/quickstep/res/values/dimens.xml b/quickstep/res/values/dimens.xml
index c85e71c..fb78ef7 100644
--- a/quickstep/res/values/dimens.xml
+++ b/quickstep/res/values/dimens.xml
@@ -258,7 +258,7 @@
     <dimen name="taskbar_contextual_button_padding">16dp</dimen>
     <dimen name="taskbar_contextual_padding_top">8dp</dimen>
     <dimen name="taskbar_nav_buttons_size">44dp</dimen>
-    <dimen name="taskbar_contextual_button_margin">47dp</dimen>
+    <dimen name="taskbar_contextual_button_margin">48dp</dimen>
     <dimen name="taskbar_hotseat_nav_spacing">24dp</dimen>
     <dimen name="taskbar_contextual_buttons_size">35dp</dimen>
     <dimen name="taskbar_stashed_size">24dp</dimen>
diff --git a/quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java b/quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java
index 1c345a6..c27caf1 100644
--- a/quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java
+++ b/quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java
@@ -270,7 +270,8 @@
                 // end-aligned, so start-align instead.
                 FrameLayout.LayoutParams navButtonsLayoutParams = (FrameLayout.LayoutParams)
                         mNavButtonContainer.getLayoutParams();
-                navButtonsLayoutParams.setMarginStart(navButtonsLayoutParams.getMarginEnd());
+                navButtonsLayoutParams.setMarginStart(
+                        resources.getDimensionPixelSize(R.dimen.taskbar_contextual_button_margin));
                 navButtonsLayoutParams.setMarginEnd(0);
                 navButtonsLayoutParams.gravity = Gravity.START;
                 mNavButtonContainer.requestLayout();