message: remove overly enthusiastic dev error handling
diff: @@ -27,7 +27,7 @@ pub fn get_preview_id(
  // directing the user to open the browser to view the output
  // this message makes sense for `wrangler preview` but not `wrangler dev`
  let sites_preview = false;
  - let script_id = upload(&mut target, user.as_ref(), sites_preview, verbose).map_err(|_| failure::format_err!("Could not upload your script. Check your internet connection or https://www.cloudflarestatus.com/ for rare incidents impacting the Cloudflare Workers API."))?;
  + let script_id = upload(&mut target, user.as_ref(), sites_preview, verbose)?;
  Ok(format!(
  "{}{}{}{}",
  &script_id,
  