docs: ddl IUP. 제거

db/ddl.sql

@@ -50,10 +50,10 @@ create table ENS_SND_DTL_KKO_TALK
     REGIST_DT                   TIMESTAMP(6),
     BILL_UID                    VARCHAR2(45)
         constraint FK_BILL_UID
-            references IUP.ENS_BILL (BILL_UID),
+            references ENS_BILL (BILL_UID),
     SEND_MAST_ID                NUMBER(19)
         constraint FK_SEND_MAST_ID
-            references IUP.ENS_SND_MAST
+            references ENS_SND_MAST
 
 );
 comment on table ENS_SND_DTL_KKO_TALK is '카카오톡 상세';