Fix the inconsistent background color between the tooltip and arrow.

Solution:
Dynamically update the background color again.

Bug: 186370178
Test: manual test
Change-Id: I203a32d54a252db52d57d4f6ed0c16a32e22ba2f

packages/SystemUI/src/com/android/systemui/accessibility/floatingmenu/BaseTooltipView.java

@@ -214,6 +214,8 @@ class BaseTooltipView extends FrameLayout {
 
         final GradientDrawable gradientDrawable = (GradientDrawable) mTextView.getBackground();
         gradientDrawable.setCornerRadius(mTextViewCornerRadius);
+        gradientDrawable.setColor(Utils.getColorAttrDefaultColor(getContext(),
+                com.android.internal.R.attr.colorAccentPrimary));
     }
 
     private void updateArrowWith(Rect anchorViewLocation) {