Iron golems should hold/drop a variety of flowers

Iron golems currently only hold red poppies, but they should do the same for several of the other flowers (with some exceptions), since the intended behaviour/concept is that they pick up a random flower to hold and sometimes drop. It would also be less confusing to those who think its vine flowers are supposed to be red just because it holds a red poppy (but they're pumpkin flowers, hence they're supposed to be yellow). Also, make the flowers a rare drop.

An alternative to this is if pumpkin flowers were added so that they only drop those as the occasional flower drop.