Replace the bubble thing in PayDay.ts with a coin thing

[Phansa]

Currently the move PayDay displays a bubble sprite instead of a coin sprite since a coin sprite isn't in the game yet. To fix this a coin sprite should be added and pay day should be changed to use the new sprite.

More specifically on line 22 of PayDay.ts the bubbleSmall should be replaced with a coin and positional values may have to be changed.
const coin = this.gameStarter.objectMaker.make(this.gameStarter.things.names.bubbleSmall);