fix: perps leverage glitch (#28960)

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## **Description**
Fix perps glitch when pressing leverage.
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## **Related issues**

Fixes:

## **Manual testing steps**

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    Given [describe expected initial app state]

    When user [verb for user action]
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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk UI-state change confined to the leverage bottom sheet’s
visibility effect; main risk is behavioral regression in how/when the
sheet opens.
> 
> **Overview**
> Prevents the Perps leverage bottom sheet from imperatively calling
`bottomSheetRef.current?.onOpenBottomSheet()` when `isVisible` becomes
true.
> 
> The visibility effect now only runs the *reset-to-initial* logic when
the sheet closes (`!isVisible`), avoiding the open/reset sequencing that
caused the leverage-press glitch.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
156209e. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: metamaskbot <metamaskbot@users.noreply.github.com>

Author: tommasini

app/components/UI/Perps/components/PerpsLeverageBottomSheet/PerpsLeverageBottomSheet.tsx

@@ -449,10 +449,7 @@ const PerpsLeverageBottomSheet: React.FC<PerpsLeverageBottomSheetProps> = ({
   }, [isCalculating, leverageChanged]);
 
   useEffect(() => {
-    if (isVisible) {
-      bottomSheetRef.current?.onOpenBottomSheet();
-    } else {
-      // Reset all state when the bottom sheet is closed
+    if (!isVisible) {
       setTempLeverage(initialLeverage);
       setDraggingLeverage(initialLeverage);
       setIsDragging(false);