[Idle Trading] Change buy function to <= price

[hyoretsu]

Having just ascended for the first time after a really long time, we don't always have enough cookies to buy all available stocks at the "Buy at" price, so it pretty much doesn't work since only a few get bought and we gotta do the rest manually.

[klattmose]

Not sure what the request is. The "Buy at" price means "if the goods price is <= the Buy at price, buy as many as possible."

[hyoretsu]

Nvm, it works per stock market tick.