MONDRIAN: correct JdbcDialectImpl.requiresUnionOrderByExprToBeInSelectClause() return value to true (accidentally changed in earlier checkin).
MONDRIAN: correct JdbcDialectImpl.requiresUnionOrderByExprToBeInSelectClause() return value to true (accidentally changed in earlier checkin).

[git-p4: depot-paths = "//open/mondrian/": change = 12942]

inevo/mondrian,inevo/mondrian