bug: OpenConnector will cause seataDriver() infinte recursion。

[106umao]

这里如果设置成自身的话，会导致 seataConnector.Driver() 方法出现死循环：seataConnection.target(dsnConnector).Driver() == seataDriver, 最后返回 &seataDriver(seataDriver)，那么这之后针对 seataDriver 的所有涉及代理对象的方法都会出现无限递归。

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If it is set to itself here, it will cause an infinite loop in the seataConnector.Driver() method: seataConnection.target(dsnConnector).Driver() == seataDriver, and finally return &seataDriver(seataDriver), then all related proxy objects for seataDriver after that method will have infinite recursion.