Refactor responsive settings checks for jQuery 4.x compatibility

[bmunslow]

This is a follow-up from #104 which has an issue whereby custom breakpoint slick settings are not being respected. This PR fixes issue #103.

[JPustkuchen]

Thanks @bmunslow great work! To make this easier usable I tagged a release in a fork: https://github.com/webksde/accessible-slick/releases/tag/1.8.1-jquery4

Composer use should be:

{
      "type": "package",
      "package": {
        "name": "webksde/accessible-slick",
        "version": "1.8.1",
        "type": "drupal-library",
        "_readme": "!! PATCHED !! See https://github.com/webksde/accessible-slick/releases/tag/1.8.1-jquery4",
        "dist": {
          "url": "https://github.com/webksde/accessible-slick/archive/refs/tags/1.8.1-jquery4.zip",
          "type": "zip"
        }
      }
    },