fix: restore referrer for preview requests - #4349

fix: restore referrer for preview requests#4349

prithq wants to merge 3 commits into

processing:developprocessing/p5.js-web-editor:developfrom

prithq:fix/4321-srcdoc-referrerprithq/p5.js-web-editor:fix/4321-srcdoc-referrerCopy head branch name to clipboard