Rename soft-wrapped back to soft-wrap

I recently renamed `Editor::setSoftWrap` and `::getSoftWrap` to `::setSoftWrapped` and `::isSoftWrapped`. I also renamed the config setting and command to match, but we've decided that wasn't a good idea.

This PR renames the config setting back to `editor.softWrap` and the command back to `editor:toggle-soft-wrap`.

Fixes #3531