[openstreetmap/openstreetmap-website] Add "No, don't load the data" choice (#1766)

[積丹尼 Dan Jacobson]

We see

```
Displaying 4664 features, which might slow your browser.

Are you sure you want to load the data?

    [Load the Data]
```
and no ```Don't load the data``` button. Only an [X].

So we push the X. And.... it loads the data!

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