[openstreetmap-website] Method to exit edit mode is unintuitive (#737)

[Saman Bemel-Benrud]

`History` and `Export` both have 'x' buttons in the sidebars to exit mode. `Edit` does not. I think this is a valid usability issue. 

Adding an 'x' button to the sidebar in id itself would be kind of weird. I think the more intuitive approach is to:

1. Remove 'x's from sidebars in `history` and `export` (for consistency).
2. Click active tab to deactivate it and return to default state.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/737#issuecomment-42230175
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