Change made to confirm to MD specs (#866)
Change made to confirm to MD specs (#866)

This part of the MD specifications says that you shouldn't have dismiss buttons: https://material.google.com/components/snackbars-toasts.html#snackbars-toasts-usage
Continuing PR #865
I tested it and it works. As far as I know there are no toasts without timeout in PSK.
abdonrd/polymer-starter-kit,abdonrd/polymer-starter-kit,Ex-ante-Labs/shopper.ninja,StartPolymer/polymer-starter-kit-plus,StartPolymer/polymer-starter-kit-plus,Ex-ante-Labs/shopper.ninja