secure-text-input.htm doesn't load Polymer

[dotnetCarpenter]

For some reason, and only in Chrome (not FIrefox and Edge), polymer is not loaded in secure-text-input.htm - header.htm loads fine though.

[dotnetCarpenter]

Operationalized in https://trello.com/c/eRYdkm9T/404-wc-openpgp-in-wc-contact-formular