[React19-blog]: Make use(context) example easier to understand

[Zeko369]

Current example was defining a local variable with the same name as the prop which was had to understand (also technically it's a runtime error)

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Name	Status	Preview	Comments	Updated (UTC)
react-dev	🛑 Canceled (Inspect)			Apr 25, 2024 9:10pm

[github-actions]

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[rickhanlonii]

Thanks!

[vittorioromeo]

How about something simpler that doesn't promote unnecessary mutability?

  const currentTheme = (theme === 'dark') ? DarkThemeContext : LightThemeContext;
  use(currentTheme);
  
  return (
    <Page theme={currentTheme}>
      {children}
    </Page>
  );

Or even inline it in the returned expression.