Last buyer should get reduced amout of how much token are left

[martinkrung]

[martinkrung]

If a buyTokens call is going over the amount of total token it fails. Better would be reducing to what's left, so tokensForSale is maxed out.

https://github.com/cryptonative-ch/mesa-smartcontracts/blob/cabdc1682dd3a7754938c30aee30f47d1aa7284a/contracts/sales/FixedPriceSale.sol#L141