修改issue脚本

epmet-module/gov-issue/gov-issue-server/src/main/resources/db/migration/V0.0.18__alter_issue_type.sql

@@ -0,0 +1,2 @@
+ALTER TABLE issue MODIFY COLUMN SOURCE_ID varchar(32) NULL COMMENT '来源ID eg:2223232(当SOURCE_TYPE为"resi_topic"时，这里指话题的ID)，issue时为空' AFTER SOURCE_TYPE;
+ALTER TABLE issue MODIFY COLUMN SOURCE_TYPE varchar(32) NULL COMMENT '来源类型 话题：resi_topic；直接立议题：issue；' AFTER ISSUE_STATUS;