Fix issues in common sql file for oracle

Author: tijsrademakers

modules/flowable-engine-common/src/main/resources/org/flowable/common/db/drop/flowable.oracle.drop.common.sql

@@ -35,7 +35,6 @@ drop index ACT_IDX_IDENT_LNK_SCOPE_DEF;
 drop table ACT_RU_IDENTITYLINK;
 
 drop index ACT_IDX_HI_IDENT_LNK_USER;
-drop index ACT_IDX_HI_IDENT_LNK_GROUP;
 drop index ACT_IDX_HI_IDENT_LNK_SCOPE;
 drop index ACT_IDX_HI_IDENT_LNK_SUB_SCOPE;
 
@@ -103,10 +102,10 @@ alter table ACT_RU_DEADLETTER_JOB
     drop CONSTRAINT ACT_FK_DJOB_CUSTOM_VAL;
 
 alter table ACT_RU_EXTERNAL_JOB
-    drop CONSTRAINT ACT_FK_DJOB_EXCEPTION;
+    drop CONSTRAINT ACT_FK_EJOB_EXCEPTION;
 
 alter table ACT_RU_EXTERNAL_JOB
-    drop CONSTRAINT ACT_FK_DJOB_CUSTOM_VAL;
+    drop CONSTRAINT ACT_FK_EJOB_CUSTOM_VAL;
 
 drop table ACT_RU_JOB;
 drop table ACT_RU_TIMER_JOB;