This patch simply modifies the header so that the game id matches Drill Dozer's and also updates the header checksum to ensure a successful boot. A similar hackfix was included in djedditt's Wario Land 4: Jungle Rumble!, so if he decides to include this hackfix in the future this separate addendum will no longer be needed.
Hopefully the makers of the openFPGA-GBA core will release an update making all of these kinds of hackfixes unnecessary.