ResizeObserver loop error when resizing changes from thumbnails to bullets

[alii23]

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Describe the bug
A clear and concise description of what the bug is.

In my implementation of react-image-gallery, larger screens display the gallery with thumbnails while smaller screens display bullets instead. It is possible to move between the two by resizing your browser window.
When moving from thumbnails to bullets in this manner, the ResizeObserver loop is not unobserved as this.thumbnailsWrapper.current obviously no longer exists, leading to an error with "ResizeObserver loop completed with undelivered notifications."

Image Gallery Version
What version of react-image-gallery are you using?
1.3.0

To Reproduce
Steps to reproduce the behavior:

1. Implement react-image-gallery where a larger screen size shows thumbnails and a smaller screen shows bullets
2. Change screen size in window from larger to smaller by dragging

Expected behavior
A clear and concise description of what you expected to happen.
No error thrown

Screenshots
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Client info (please complete the following information):\

• OS: [e.g. iOS] Windows
• Browser: [e.g. chrome, safari] Chrome

Additional context
Add any other context about the problem here.