[FIX] payment*: fix invalid coding

-*- coding: utf-'8' "-*-"

is not a valid encoding. Introduced by
666387a274 I think. It was probably a
typo/replace gone bad and it got copy-pasted everywhere. Emacs complains
every time you try to save changes to files with this invalid encoding.

This changes all of them to

coding: utf-8

adhering to eae045949d.

Done with:

find . -name '*.py' -print0 |\
xargs -0 sed -ie 's/-\*- coding: utf-'"'"'8'"'"' "-\*-"/coding: utf-8/'

addons/payment/models/payment_acquirer.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-'8' "-*-"
+# coding: utf-8
 import logging
 
 import openerp

addons/payment_adyen/models/adyen.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-'8' "-*-"
+# coding: utf-8
 
 import base64
 import json

addons/payment_authorize/models/authorize.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-'8' "-*-"
+# coding: utf-8
 
 import hashlib
 import hmac

addons/payment_buckaroo/models/buckaroo.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-'8' "-*-"
+# coding: utf-8
 from hashlib import sha1
 import logging
 import urllib

addons/payment_ogone/models/ogone.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-'8' "-*-"
+# coding: utf-8
 
 import datetime
 from hashlib import sha1

addons/payment_paypal/models/paypal.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-'8' "-*-"
+# coding: utf-8
 
 import base64
 import json

addons/payment_sips/models/sips.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-'8' "-*-"
+# coding: utf-8
 
 import json
 import logging

addons/payment_stripe/models/payment_acquirer.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-'8' "-*-"
+# coding: utf-8
 
 from odoo import api, fields, models
 

addons/payment_stripe/models/payment_method.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-'8' "-*-"
+# coding: utf-8
 
 import requests
 

addons/payment_stripe/models/payment_transaction.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-'8' "-*-"
+# coding: utf-8
 
 import json
 import logging