Removed wp_verify_nonce in wc_create_new_customer

The check is already done in includes/class-wc-form-handler.php 843 and includes/class-wc-checkout.php 398

On the registration made during checkout caused the error:
PHP Notice:  Undefined index: register in woocommerce/includes/wc-customer-functions.php on line 53
prevents automatic password generation when making the registration in the My Account page, closes #4672
fixed the indentation in includes/wc-customer-functions.php
fixed some coding standards in includes/wc-customer-functions.php
Merge pull request #4730 from claudiosmweb/fix_4672

Corrections for the wc_create_new_customer() function