allow anyone to execute the payout of an auction

[mykcryptodev]

Currently, only the auction creator can execute the payout of an auction. Since there is no logic in the contract that would send the funds anywhere other than the auction creator, we should allow anyone to execute this function.

This is useful for when the buyer wants to receive the NFT upon the end of an auction, the buyer has the option for the seller to be paid out in the same transaction.

It is especially useful because there doesn't seem to be a straight-forward way for a front-end dapp to know if the buyer has only closed the auction for themselves in which case the sdk's function for ("executeSale")[https://portal.thirdweb.com/typescript/sdk.englishauctions#executesale] will fail. By allowing anyone to close out the entire auction, dapps can show the "executeSale" button to all users and they will all be able to execute it.

[nkrishang]

Thanks @mykcryptodev, we'll be merging the PR shortly.

[nkrishang]

@mykcryptodev Could you make the following change:

Right now, you've edited nonReentrant onlyAuctionCreator(_auctionId) to nonReentrant(_auctionId). This is incorrect, since the (_auctionId) argument is meant for the onlyAuctionCreator modifier, and nonReentrant doesn't take any arguments.

The right edit would be nonReentrant onlyAuctionCreator(_auctionId) to just nonReentrant

[mykcryptodev]

@nkrishang good catch! Thank you for considering the change ❤️