[DBI Backend] Remove unused TableOpTypes.

libgnucash/backend/dbi/gnc-backend-dbi.hpp

@@ -51,9 +51,7 @@ class GncSqlRow;
  */
 enum TableOpType
 {
-    drop = 0,
-    empty,
-    backup,
+    backup = 0,
     rollback,
     drop_backup
 };

libgnucash/backend/dbi/gnc-dbisqlconnection.cpp

@@ -672,13 +672,6 @@ GncDbiSqlConnection::table_operation(TableOpType op) noexcept
             case drop_backup:
                 result = table_manage_backup (table, op);
                 break;
-            case empty:
-                result = dbi_conn_queryf (m_conn, "DELETE FROM TABLE %s",
-                                          table.c_str());
-                break;
-            case drop:
-            default:
-                result = dbi_conn_queryf (m_conn, "DROP TABLE %s", table.c_str());
                 break;
             }
         }