Steem Load Balancer: Fix a Crash due to BadRequestError

Yesterday, https://steem.justyy.com crashed and showed "No valid node found".

I've checked the log and it has thrown a "BadRequestError: request aborted" Error

I've checked with ChatGPT, and here is the proper fix to avoid parsing the JSON twice (and forcing every request to be JSON)

https://github.com/DoctorLai/steem-load-balancer/commit/ec8397d7ae4b4aeb79dcb1dfd2d9d9887b4d2c3c

I've deployed to both https://steem.justyy.com and https://api.steemyy.com and also uploaded a prebuilt image to: justyy/steem-load-balancer

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