[openstreetmap/openstreetmap-website] Improve textarea behaviour (#2464)

[hikemaniac]

This PR adds the resize: vertical CSS property to comment textareas to fix a problem, where they could be dragged beyond the sidebar.
Furthermore, I've added a min-height to all textareas to not let them be too small to enable the display of a scrolling bar.
I've also added a border-radius, to make the form fields more consistent with what we do with buttons and tables.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2464

-- Commit Summary --

  * Fixed comment textarea going off the sidebar, added border-radius to form fields

-- File Changes --

    M app/assets/stylesheets/common.scss (6)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2464.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2464.diff

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