[Bug]: SL & TP percentages change when changing leverage

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### Describe the bug

When opening a position with **Auto Close** enabled, setting **15% Take Profit** and **15% Stop Loss**, and then changing the **leverage**, the SL & TP percentages change unexpectedly. The values should remain fixed at what the user set regardless of leverage adjustments.

### Expected behavior

The Stop Loss and Take Profit percentages set by the user should remain unchanged when the leverage is modified. Only the corresponding price levels should recalculate, not the user-defined percentages.

### Screenshots/Recordings

https://www.loom.com/share/7cf23eab66af4629834094da78ca5917

### Steps to reproduce

1. Open MetaMask Extension
2. Navigate to **Perps** and open a new position
3. Enable **Auto Close**
4. Set **Take Profit to 15%** and **Stop Loss to 15%**
5. Change the **leverage**
6. Observe that the SL & TP percentages change

### Error messages or log output

_No error message displayed._

### Where was this bug found?

Internal release testing

### Version

13.37.0

### Build type

_No response_

### Browser

Chrome

### Operating system

MacOS

### Hardware wallet

_No response_

### Additional context

- Team: Perps

### Severity

_To be filled by internal support / PM_

Start by reproducing the issue in the MetaMask Extension Perps flow using the listed steps, focusing on Auto Close while changing leverage. Trace the position form's Stop Loss and Take Profit handling and verify that the user-entered percentages remain unchanged while only the corresponding price levels recalculate.

Written by the indexing model from the issue text.