fix focus-visible import

[Lausselloic]

fix(focus-visible): fix focus-visible import in boosted.js and remove focus-visible from peer-dependencies

fix #672

[julien-deramond]

OK for this modification.

Because we haven't reviewed it quickly, maybe rebase it and check if the bundlewatch new values are still coherent.

Just a question because I don't know much about "jspm", you don't need to remove the focus-visible dependency as well in the following section in package.json?

"jspm": {
    "registry": "npm",
    "main": "js/boosted",
    "directories": {
      "lib": "dist"
    },
    "shim": {
      "js/boosted": {
        "deps": [
          "focus-visible",
          "jquery",
          "popper.js",
          "tablesorter",
          "swiper"
        ],
        "exports": "$"
      }
    },
    "dependencies": {},
    "peerDependencies": {
      "focus-visible": "^5.2.0",
      "jquery": "1.9.1 - 3",
      "popper.js": "^1.16.1",
      "tablesorter": "^2.31.3",
      "swiper": "^6.5.1"
    }
  }

[julien-deramond]

I propose to remove as well focus-visible from jspm which works like npm from what I have understood. @Lausselloic if you are OK with it, I can merge this PR.