Trigger theme change if supportsDarkText is switching.

Change-Id: Id5ec0429b5fb94d742dfac093263144f71f0d6b7
diff --git a/src/com/android/launcher3/dynamicui/WallpaperColorInfo.java b/src/com/android/launcher3/dynamicui/WallpaperColorInfo.java
index 7470118..e23f42f 100644
--- a/src/com/android/launcher3/dynamicui/WallpaperColorInfo.java
+++ b/src/com/android/launcher3/dynamicui/WallpaperColorInfo.java
@@ -63,8 +63,9 @@
     public void onColorsChanged(WallpaperColorsCompat colors, int which) {
         if (which == FLAG_SYSTEM) {
             boolean wasDarkTheme = mIsDark;
+            boolean didSupportDarkText = mSupportsDarkText;
             update(colors);
-            notifyChange(wasDarkTheme != mIsDark);
+            notifyChange(wasDarkTheme != mIsDark || didSupportDarkText != mSupportsDarkText);
         }
     }