buildhistory: Restoring files from preserve list

This fix will ensure that, when we activate feature
`BUILDHISTORY_RESET`, files marked to keep on feature
`BUILDHISTORY_PRESERVE` will indeed exist is buildhistory
final path since they are moved to buildhistory/old but
not restored at any point.

(From OE-Core rev: 8160fd3c042283a47a2601e1797847c303e1e7e5)

Signed-off-by: Pedro Ferreira <Pedro.Silva.Ferreira@criticaltechworks.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 9f68a45aa238ae5fcdfaca71ba0e7015e9cb720e)
Signed-off-by: Steve Sakoman <steve@sakoman.com>