Fix the logic of VarBase _to func #37193
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Bug fixes
PR changes
APIs
Describe
PR36965 : VarBase provides a '_to' interface that copies the current varbase to target device and dtype.
同时修改 place 和 dtype 将存在 bug，例如：框架的 device 设置为 place1，通过 copy_to() 得到 place2 上的数据 new_t，如果在 place1 上对 place2 上的 new_t 调用 cast 操作将会有 bug。
参考 layer.to 的修复PR #37156