wacca: fix crash on 4th page of Reverse Gate, partially fixes #5

core/data/schema/versions/SDFE_3_rollback.sql

@@ -0,0 +1,3 @@
+SET FOREIGN_KEY_CHECKS=0;
+--Can't really add items back so this just does nothing
+SET FOREIGN_KEY_CHECKS=1;

core/data/schema/versions/SDFE_4_upgrade.sql

@@ -0,0 +1,3 @@
+SET FOREIGN_KEY_CHECKS=0;
+DELETE FROM wacca_item WHERE type=17 AND item_id=312002;
+SET FOREIGN_KEY_CHECKS=1;