OIDC Logout Bug (#14545)

* fixes issue with token auth selected after logging out from oidc or jwt methods

* adds changelog entry

* reverts backendType var name change in auth-form authenticate method

ui/app/components/auth-jwt.js

@@ -165,7 +165,6 @@ export default Component.extend({
       return this.handleOIDCError(e);
     }
     let token = resp.auth.client_token;
-    this.onSelectedAuth('token');
     this.onToken(token);
     yield this.onSubmit();
   }),