Problems with Twig name suggestions

With Twig debug on, the module shows unusable file name suggestions:

<!-- FILE NAME SUGGESTIONS:
   * dynamic-layout:product--node--16.html.twig
   * dynamic-layout:product--node-products-default.html.twig
   * dynamic-layout:product--node-products.html.twig
   * dynamic-layout:product--node-default.html.twig
   * dynamic-layout:product--node.html.twig
   x dynamic-layout-frontend.html.twig
   x dynamic-layout-frontend.html.twig
-->

Files cannot be named using colons on a Windows environment, and there may be problems in some Unix systems as well (See related issue).

Colons should be replaced with dashes to preserve compatibility.