Update particles-demo.tsx

[qamarq]

I updated theme prop from useTheme hook to resolvedTheme cause of case with system theme. In theme prop in that case will be "system" but in resolvedTheme var will be "dark" or "light"

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[qamarq]

Good catch. But can you give me a small details about how it affects the performance or what it improves?

Literally no affect on performance and its fixing bug when u have theme vairbale setted to 'system' (like default). my solution is fixing that and even if u have system colors mode, its giving dark or light.