SpamScope / mail-parser / 30493415175 / 1

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Fix broken string literal that disabled the quoted-printable attachment branch (#163)

A line-continuation inside the string literal made the comparison target
"quoted-                       printable" (the continuation line's indentation
became part of the string), so it never equalled "quoted-printable". The
branch handling quoted-printable application/* attachments was therefore dead:
such attachments fell through to the text branch and were decoded as UTF-8 with
errors="ignore", silently dropping every non-UTF8 byte and mis-flagging
binary=False.

Join the literal so the comparison works. Added a test with a quoted-printable
application/octet-stream attachment that round-trips losslessly.

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