fix: Prevents Extra Screen Render when navigation index has not changed

[Zernach]

What does this PR do?

• This PR prevents the bottomsheet screen from being rendered a second time if the navigation index has not changed.

How should this be manually tested?

• Add a console.log to any of your bottomsheet screens to track how many times the screen is rendered.
• On the main branch, navigate to your bottomsheet screen, and you'll notice that the screen is being rendered twice, which inadvertently/unexpectedly dismisses the keyboard and clears the text input(s).
• On this PR branch, you'll notice that the screen is only being rendered once (unless the navigation index changes and it needs to render a second time).

Background Information

• This issue was discovered when using @gorhom/bottom-sheet and I was able to trace the issue back to the react-navigation-bottom-sheet repository and fix it here in this PR.

❌ Before Video

BEFORE — Renders twice. The second render happens ~1 second after mount. The second render causes the entire screen to be re-rendered, which inadvertently/unexpectedly dismisses the keyboard and clears the text input(s).

Kapture.2025-05-06.at.11.30.09.mp4

✅ After Video

AFTER — Only renders when needed!

Kapture.2025-05-06.at.11.30.45.mp4