Remove incorrect OWNER_ column for DB2

Author: tijsrademakers

modules/flowable-engine/src/main/resources/org/flowable/db/create/flowable.db2.create.history.sql

@@ -36,7 +36,6 @@ create table ACT_HI_ACTINST (
     CALL_PROC_INST_ID_ varchar(64),
     ACT_NAME_ varchar(255),
     ACT_TYPE_ varchar(255) not null,
-    OWNER_ varchar(64),
     ASSIGNEE_ varchar(255),
     COMPLETED_BY_ varchar(255),
     START_TIME_ timestamp not null,