UI: Use binary mode for QuickReadFile

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When not using binary mode (i.e. text mode) CRLF will be converted to
LF, which means that the size provided by tellg() is no longer correct,
and reading prematurely hits an EOF and sets the fail bit.

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500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f