Set navBarDarkIntensity based on dark theme in SUW

- Also remove old tinting based on textColorPrimary, as it's no longer necessary with dark intensity tinting.

Test: Run SetupWizardTestActivity in both dark and light theme, ensure back button visible
Fixes: 204384193
Change-Id: I2dc2e94bc0318ded62419b9ae0eed719db289d7f
diff --git a/quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java b/quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java
index 48b0f6d..6de876c 100644
--- a/quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java
+++ b/quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java
@@ -40,6 +40,7 @@
 import android.annotation.LayoutRes;
 import android.content.pm.ActivityInfo.Config;
 import android.content.res.ColorStateList;
+import android.content.res.Configuration;
 import android.graphics.Rect;
 import android.graphics.Region;
 import android.graphics.Region.Op;
@@ -60,7 +61,6 @@
 import com.android.launcher3.anim.AlphaUpdateListener;
 import com.android.launcher3.taskbar.TaskbarNavButtonController.TaskbarButton;
 import com.android.launcher3.util.MultiValueAlpha;
-import com.android.launcher3.util.Themes;
 import com.android.quickstep.AnimatedFloat;
 import com.android.systemui.shared.rotation.FloatingRotationButton;
 import com.android.systemui.shared.rotation.RotationButton;
@@ -198,15 +198,12 @@
                 navButtonsLayoutParams.gravity = Gravity.START;
                 mNavButtonContainer.requestLayout();
 
-                if (!isThreeButtonNav) {
-                    // Tint all the nav buttons since there's no taskbar background in SUW.
-                    for (int i = 0; i < mNavButtonContainer.getChildCount(); i++) {
-                        if (!(mNavButtonContainer.getChildAt(i) instanceof ImageView)) continue;
-                        ImageView button = (ImageView) mNavButtonContainer.getChildAt(i);
-                        button.setImageTintList(ColorStateList.valueOf(Themes.getAttrColor(
-                                button.getContext(), android.R.attr.textColorPrimary)));
-                    }
-                }
+                // TODO(b/210906568) Dark intensity is currently not propagated during setup, so set
+                //  it based on dark theme for now.
+                int mode = mContext.getResources().getConfiguration().uiMode
+                        & Configuration.UI_MODE_NIGHT_MASK;
+                boolean isDarkTheme = mode == Configuration.UI_MODE_NIGHT_YES;
+                mTaskbarNavButtonDarkIntensity.updateValue(isDarkTheme ? 0 : 1);
             }
 
             // Animate taskbar background when any of these flags are enabled