Revert "flacparse: fix header rewriting being ignored"

This caused broken metadata and also looks a bit dodgy.
Revert until we can figure out a solution that works for
all cases and doesn't break anything.

This reverts commit adeee44b07a173b9ab4253216caba8f66dd43abb.

https://bugzilla.gnome.org/show_bug.cgi?id=727802
https://bugzilla.gnome.org/show_bug.cgi?id=785558
2 files changed