Change esri css url to https

[tonivrbic]

Inside the environments.ts file the arcGisCssUrl uses http:// instead of https:// or just ://. This causes, on sites using https, blocking of loading the stylesheet because it violates the mixed content policy.

[dLeung09]

This has caused issues for me as well

[rosostolato]

I resolved by myself and created a pull request. For now, I published a new package on npm while my PR is not approved: https://www.npmjs.com/package/angular-esri-components-https