Remove dead payment.provider create() override

The override guarded on self.code inside create(), which is empty on the
model-level recordset, so the branch never ran; it also called a
misspelled helper (generate_privakey). Removing it lets the private key be
generated during pairing as intended, and keeps copying a provider from
regenerating (and thus invalidating) an already paired key.

payment_btcpayserver/models/payment_provider.py

@@ -1,6 +1,6 @@
 import logging
 
-from odoo import _, api, fields, models
+from odoo import api, fields, models
 from .libs.client import BTCPayClient
 from .libs import crypto
 
@@ -20,15 +20,9 @@ class PaymentProvider(models.Model):
     btcpay_privateKey = fields.Text(string='Private Key', help='Private Key for BTCPay Client. Leave empty, will be autogenerated during pairing.')
     btcpay_facade = fields.Char(string='Facade', help='Token facade type: merchant/pos/payroll. Keep merchant', default='merchant')
 
-    def create(self, values_list):
-        if self.code == 'btcpayserver':
-            values_list['btcpay_privateKey'] = crypto.generate_privakey()
-
-        return super(PaymentProvider, self).create(values_list)
-
     @api.onchange('btcpay_pairingCode')
     def _onchange_pairingCode(self):
-        if not self.btcpay_token and self.code == 'btcpayserver' and not self.btcpay_pairingCode == '':
+        if not self.btcpay_token and self.code == 'btcpayserver' and self.btcpay_pairingCode:
             #_logger.info("ONCHANGE PAIRING CODE***SELF:  %s %s %s", self.btcpay_location, self.btcpay_privateKey, self.btcpay_pairingCode)
             self.btcpay_privateKey = crypto.generate_privkey()
             client = BTCPayClient(host=self.btcpay_location, pem=self.btcpay_privateKey)