trades widget shows out of order timestamps

[ioanwurf]

Following the reported issue at Loopring/protocols#2591. When digging that issue, I also noticed that the dexwebapp do not show the right timestamp of the orders. See the following screenshot:

Initially, I thought the trades were out-of-order. But then I noticed the "second" value been over 60. I checked the latest trades with the api (https://api3.loopring.io/api/v3/trade?market=LRC-USDC&limit=200&fillTypes=mixed) and they are in synch. So, I think there's an issue on the way those timestamps are printed.

I would like to open a PR to fix that, but unfortunately I do not have enough time rn.