Transfer siege participation rewards (StrangeCoins) from boss to pawns.

When sieges happened, a lot of us did not bother fighting spawns and just waited for the boss to appear, as most of the reward was with the boss.

Note: boss still has to be whacked for the siege to be won, so perhaps it should not give any separate rewards at all?

also note: $coinsrate might be better to be set *2 elsewhere? idk.