Avoid unwanted re-render on resize

[dubzzz]

While digging into the source code of the library to investigate a runtime crash I had in one of my app, I found this quick optimization. I though it could still be useful to share it but feel free to reject it if it does not make sense.

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Up-to-now the current implementation watches the event onWindowResize and triggers a state update anytime it receives an event related to resize even if the size of the offset was not updated.

The PR just removes this unneeded re-render by not updating the state in such case.

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[STRML]

Thanks. It seems fairly unlikely that the window would resize and the grid wouldn't change width, unless of course it was being used in a fixed-width layout. But if it were, why would you be using <WidthProvider> at all?

[dubzzz]

Trying to find back why I needed it 😂 Will come back to you when I get a better idea of my original need (don't remember at all why I proposed the fix)

I think I initially opened the PR because doing the quick ternary can save some unwanted re-render I got on my production app from time to time because of re-renders on parent components... As the re-render was quick to avoid I suggested this change as it removes one unneeded render even if such render is rare as it can still happen from time to time.

Mostly a free optimization 🤔