narrower.js and narrower.js missing in editor.html

## Reproduce code
`
{ signal: [
  { name: "clk",     wave: "p...." },
  { name: "Data",    wave: "x345x",  data: ["head", "body", "tail"] },
  { name: "Request", wave: "01..0" }
  ],
  config: { skin: "narrower" }
}
`
## Issue cause
The narrower.js and narrowerer.js missing in editor.html cause the skin narrower and narrowerer missing in https://wavedrom.com/editor.html.

