Remove references to "self"
Remove references to "self"

Assigning a self variable gets around the fact that the `this`
variable in javascript refers to different things in different
contexts.

We're not actually using this anywhere, so let's just junk it.

alphagov/digitalmarketplace-supplier-frontend,alphagov/digitalmarketplace-supplier-frontend,alphagov/digitalmarketplace-supplier-frontend,alphagov/digitalmarketplace-supplier-frontend