fix(golden): Removed duplicate fixLineEndings

[pranavkrishnan02]

• This function does not work correctly when the byte sequence contains a slice like \r\r\n
• This is because we're applying fixLineEndings(goldenBts) twice to goldenBts(before writing to the file and after reading from it) and once to out
• To reproduce, run go test -v ./... -update on https://github.com/caarlos0/teatest-example. Use the latest version of teatest
• An alternative solution might be to replace all occurrences of the form \r\r\r\r...\n with \n