[FIX] payment_paypal: fix paypal onboarding

after paypal onboarding, merchant email and pdt token
is not required at all, for the new users.
They can accept payment with just email address.

closes odoo/odoo#38756

Signed-off-by: Damien Bouvy (dbo) <dbo@odoo.com>

addons/payment_paypal/views/payment_views.xml

@@ -10,8 +10,8 @@
                 <xpath expr='//group[@name="acquirer"]' position='inside'>
                     <group attrs="{'invisible': [('provider', '!=', 'paypal')]}">
                         <field name="paypal_email_account" attrs="{'required':[ ('provider', '=', 'paypal'), ('state', '!=', 'disabled')]}"/>
-                        <field name="paypal_seller_account" attrs="{'required':[ ('provider', '=', 'paypal'), ('state', '!=', 'disabled')]}"/>
-                        <field name="paypal_pdt_token" attrs="{'required':[ ('provider', '=', 'paypal'), ('state', '!=', 'disabled')]}"/>
+                        <field name="paypal_seller_account"/>
+                        <field name="paypal_pdt_token"/>
                         <field name="paypal_use_ipn" attrs="{'required':[ ('provider', '=', 'paypal'), ('state', '!=', 'disabled')]}"/>
                         <a colspan="2" href="https://www.odoo.com/documentation/user/online/ecommerce/shopper_experience/paypal.html" target="_blank">How to configure your paypal account?</a>
                     </group>