Correctly serialize population

All populations were being set to 0, causing all colors to be wrong.

Test: manual
Bug: 191391779
Bug: 191374703
Change-Id: Id5bef180ca3e6f30e30631781a74b2efb4402ac5

core/java/android/app/WallpaperColors.java

@@ -420,7 +420,7 @@ public final class WallpaperColors implements Parcelable {
         for (Map.Entry<Integer, Integer> colorEntry : mAllColors.entrySet()) {
             if (colorEntry.getKey() != null) {
                 dest.writeInt(colorEntry.getKey());
-                Integer population = mAllColors.get(colorEntry.getValue());
+                Integer population = colorEntry.getValue();
                 int populationInt = (population != null) ? population : 0;
                 dest.writeInt(populationInt);
             }