Follow up to https://github.com/zed-industries/zed/pull/55542, which
reused the shifted offset for the rename input's *initial selection*,
cutting it one character short.

<img width="524" height="512" alt="image"
src="https://github.com/user-attachments/assets/37032614-2cfd-4ad4-9005-f2eac57924a1"
/>
<img width="435" height="158" alt="image"
src="https://github.com/user-attachments/assets/7b1b9c52-08d6-48ce-928a-873f6e175f65"
/>

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Release Notes:

- Fixed symbol rename in vim mode omitting the last character of the
symbol out of the rename input's initial selection