Fix prop type check on 'New collection' page

[Prashant-thakur77]

Fixed a prop type validation warning in the New Collection page where the maxlength prop was receiving a string value "200" instead of the expected number 200

References

Fixes #5648

Reviewer guidance

How to Get There

• Navigate to /channels/#/collections/new URL

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[MisRob]

Thank you @Prashant-thakur77 :)!