[openstreetmap/openstreetmap-website] Add display:block to the editor iframe (PR #6274)

[Josh Lee]

### Description

Pressing the down arrow key will sometimes scroll the parent element of the iframe, since it generates an inline box with some whitespace below. This parent element having overflow: hidden meant that it was impossible to scroll deliberately and I would be stuck with a white gutter on the bottom of the viewport for the remainder of my editing session.

Instead of overflow: hidden, give the iframe display: block to avoid generating an inline block.

### How has this been tested?

Manually in Firefox and Chrome.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6274

-- Commit Summary --

  * Add display:block to the editor iframe

-- File Changes --

    M app/views/site/_id.html.erb (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6274.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6274.diff

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