Fix color contrast in All Apps text by setting the color to onSurfaceVariant

bug: 322293478
Test:
All Apps divider:
before lightTheme: https://drive.google.com/file/d/1MTL1iEX_icYWfT52WeZIgqLK46koLM_s/view?usp=sharing
after lightTheme: https://drive.google.com/file/d/1ME1Gk8bUIXIe1P_Z5pvcpi3VS0_L0mVK/view?usp=sharing
before darkTheme: https://drive.google.com/file/d/1MLcv32M2JWyVqPklMdZLJAkj8KnyXwtB/view?usp=sharing
after darkTheme: https://drive.google.com/file/d/1MJjgP42xgp7SCifHAfREzgWvw6KupvlR/view?usp=sharing
All Apps text:
before light theme:https://drive.google.com/file/d/1MCu6xtpCMCxtDpnAv3fhCDSafBJGX4rx/view?usp=sharing
after light theme:https://drive.google.com/file/d/1M6ilveUw2q0FIlo-NSxt8KEWKRbQvwhk/view?usp=sharing
before dark theme:https://drive.google.com/file/d/1MCOxt9MeWxgN65T2s0OKzybiPu4qI4PD/view?usp=sharing
after dark theme: https://drive.google.com/file/d/1MAXnRmG8NVMu1bCseVWn6GC2322gQ0sX/view?usp=sharing
Flag: None

Change-Id: Iedb12d7b11b215c6668e7b5e6637189da3d67ebc
diff --git a/quickstep/src/com/android/launcher3/appprediction/AppsDividerView.java b/quickstep/src/com/android/launcher3/appprediction/AppsDividerView.java
index 037f7a8..694475a 100644
--- a/quickstep/src/com/android/launcher3/appprediction/AppsDividerView.java
+++ b/quickstep/src/com/android/launcher3/appprediction/AppsDividerView.java
@@ -77,19 +77,15 @@
     public AppsDividerView(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
 
-        boolean isMainColorDark = Themes.getAttrBoolean(context, R.attr.isMainColorDark);
         mDividerSize = new int[]{
                 getResources().getDimensionPixelSize(R.dimen.all_apps_divider_width),
                 getResources().getDimensionPixelSize(R.dimen.all_apps_divider_height)
         };
 
-        mStrokeColor = ContextCompat.getColor(context, isMainColorDark
-                ? R.color.all_apps_prediction_row_separator_dark
-                : R.color.all_apps_prediction_row_separator);
+        mStrokeColor = ContextCompat.getColor(context, R.color.material_color_outline_variant);
 
-        mAllAppsLabelTextColor = ContextCompat.getColor(context, isMainColorDark
-                ? R.color.all_apps_label_text_dark
-                : R.color.all_apps_label_text);
+        mAllAppsLabelTextColor = ContextCompat.getColor(context,
+                R.color.material_color_on_surface_variant);
 
         mShowAllAppsLabel = !ALL_APPS_VISITED_COUNT.hasReachedMax(context);
     }