Rename _paymentView to _paymentForm to match class
Rename _paymentView to _paymentForm to match class

Change-Id: I5c728ad48c10403951178625574bbc3863341cf7

agektmr/pwa-ecommerce-demo,agektmr/pwa-ecommerce-demo,google-developer-training/pwa-ecommerce-demo,google-developer-training/pwa-ecommerce-demo