Fix the text color used on the notification unread indicator.

Change-Id: I911c20f7e7ebec494e7a7d4d31d2ce61e438d3ab
Fixes: 313614534
Test: manual inspection in normal and B&W themes; light and dark
Flag: NONE
diff --git a/core/java/android/app/Notification.java b/core/java/android/app/Notification.java
index 476232c..ed0cfbe 100644
--- a/core/java/android/app/Notification.java
+++ b/core/java/android/app/Notification.java
@@ -5652,7 +5652,7 @@
                 pillColor = Colors.flattenAlpha(
                         getColors(p).getTertiaryFixedDimAccentColor(), bgColor);
                 textColor = Colors.flattenAlpha(
-                        getColors(p).getOnTertiaryAccentTextColor(), pillColor);
+                        getColors(p).getOnTertiaryFixedAccentTextColor(), pillColor);
             }
             contentView.setInt(R.id.expand_button, "setHighlightTextColor", textColor);
             contentView.setInt(R.id.expand_button, "setHighlightPillColor", pillColor);