修改NerdTree快捷键有问题
### Expected behavior.

希望修改NerdTree的快捷键由<F3>变为<F4>


### The reproduce ways from Vim starting.

![1](https://github.com/user-attachments/assets/34dd6410-541c-4ccc-9bd2-75c439bcfaae)


### Output of the `:SPDebugInfo!`

![2](https://github.com/user-attachments/assets/a526f499-76d8-4a4a-8950-9813b3b19384)
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另外，每次收起NerdTree侧边栏，状态栏会报错，很烦人
![3](https://github.com/user-attachments/assets/f81fa627-8710-4983-8e18-090f7c5d0942)
