Fix drop-in view controller activity indicator
Fix drop-in view controller activity indicator

A bug in drop-in view controller caused the submit button's loading
indicator to continue showing when paying with a previously
tokenized payment method (e.g. vaulted card, PayPal account).

braintree/braintree_ios,Feverup/braintree_ios,braintree/braintree_ios,apascual/braintree_ios,billCTG/braintree_ios,billCTG/braintree_ios,apascual/braintree_ios,Feverup/braintree_ios,braintree/braintree_ios,billCTG/braintree_ios,billCTG/braintree_ios,billCTG/braintree_ios,braintree/braintree_ios,apascual/braintree_ios,Feverup/braintree_ios,Feverup/braintree_ios,apascual/braintree_ios