Remove "dav1d/" prefix from david.h includes
This partially reverts !1721 (merged). The other headers in include/dav1d
do not use the dav1d/
prefix. For example, picture.h
does #include "common.h"
and #include "headers.h"
.
As far as I can tell, there's no reason for dav1d.h
to use the dav1d/
prefix. Removing the prefix and using local paths is both preferable and more consistent.