fix(Stats): let the widget render on all values

[bobylito]

This removes the implementation of shouldComponentUpdate. This can be seen as a regression but given that it's a pretty simple widget, the impact shouldn't be noticeable.

Fix #3056

[algobot]

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[samouss]

We implement this hook in several other components ClearAll, PaginationLink, RefinementListItem, ... We can also take a look at this other components. This hook is an escape hatch in most cases we don't need to implement it. Except when we hit a performance issue.

[bobylito]

We implement this hook in several other components ClearAll, PaginationLink, RefinementListItem, ... We can also take a look at this other components. This hook is an escape hatch in most cases we don't need to implement it. Except when we hit a performance issue.

Unlike this component, the others don't create issue as far as we know and they have been implemented as part of a general performance. Let's consider the case of the other on case by case basis.