Update firefox-beta to 55.0b2 (#4006)
Update firefox-beta to 55.0b2 (#4006)

fix sha for zh-TW
fix sha zh-CN
lantrix/homebrew-versions,caskroom/homebrew-versions,Ngrd/homebrew-versions,mahori/homebrew-versions,yurikoles/homebrew-versions,wickedsp1d3r/homebrew-versions,pkq/homebrew-versions,rogeriopradoj/homebrew-versions,rogeriopradoj/homebrew-versions,caskroom/homebrew-versions,FinalDes/homebrew-versions,victorpopkov/homebrew-versions,yurikoles/homebrew-versions,victorpopkov/homebrew-versions,wickedsp1d3r/homebrew-versions,pkq/homebrew-versions,mahori/homebrew-cask-versions,404NetworkError/homebrew-versions,FinalDes/homebrew-versions,lantrix/homebrew-versions,Ngrd/homebrew-versions,404NetworkError/homebrew-versions