Revert "multifilesink: streamline the file-switch code a bit"

Revert "multifilesink: streamline the file-switch code a bit"

This reverts commit f1ceaab02f3f557e23b77b14771a575788f92bb4.

This broke atomic file writes in "buffer" mode. It did make
sure that any streamheaders are prepended to each file in
buffer mode as well, but that's not really needed in practice,
whereas atomic file writes are, so let's restore the status
quo ante for now since this was primarily a code cleanup anyway,
and if anyone needs to streamheaders in buffer mode too they
can make a patch to implement that differently. Re-implementing
the atomic writes in the element also seems way too much work.

https://bugzilla.gnome.org/show_bug.cgi?id=766990