[FIX] website_payment: prevent donation form to crash when field error

When a field had an error (required, wrong format etc), upon submission
of the form there would be a JS traceback preventing the page to work
anymore (the Donate button would spin forever).

This is because the code was not adapted to the Bootstrap 5 migration.

It seems like this code to update the config's content is not required
anymore, as without it the content is correctly updated through the
existing `.popover()` call a line above.
You can ensure that by simply omitting your email and send the form, it
will tell you that the email is required. Then just type "a" in the
email field and send again, it will tell you that the format is not
correct.
Somehow, it seems to also be the case in Odoo 15 in Bootstrap 4,
removing those line do not break that.

Some fixes were made at [1] and [2] about the same issue but somehow
people just fixed their own case, while grepping `.config.content` would
have easily found this one too.

[1]: https://github.com/odoo/odoo/commit/37546006940f99c8860e89997ed7a623abd5fa72
[2]: https://github.com/odoo/odoo/commit/0cff1dc2967cafeb8964ed0802c309d3bb7f7525

opw-3381196

closes odoo/odoo#126444

X-original-commit: 9e46ceea801d5044f5db4fee65d5980c64cfa23b
Signed-off-by: Romain Derie (rde) <rde@odoo.com>

addons/website_payment/static/src/js/website_payment_form.js

@@ -54,7 +54,6 @@ checkoutForm.include({
                     const $field = this.$('input[name="' + id + '"],select[name="' + id + '"]');
                     $field.addClass('is-invalid');
                     $field.popover({content: errorFields[id], trigger: 'hover', container: 'body', placement: 'top'});
-                    $field.data("bs.popover").config.content = errorFields[id];
                 }
                 this._displayError(
                     _t("Validation Error"),