[FIX] type error when exporting to tarfiles

When exporting to a tarfile, we first export each module's translations
to a file on the FS, then create a tarball from all of them.

With the P3 bytes/string split, translation export was defined to export
to a bytes IO object in order to work correctly with CSV (which work on
bytes IO for better cross-version compatibility). However the tgz file
export was left opening module's files in `w` mode, which in P3 means
text, which blows up as POFile expects to ultimately write to a bytes IO
object: it uses text, and a StreamReaderWriter is used to translate that
into an underlying bytes IO.

Fix by explicitly opening the files in binary mode.

Fixes #22700

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