Remove excessive loggin when confirming order via Shopware API

[supercid]

Description

Remove unnecessary logging
Fix missing ISO code in customer buyer object, which would invalidate orders

Related Issue

Closes #244

Motivation and Context

Excessive and unnecessary logging

How Has This Been Tested?

PUT this:

{
    "paymentStatusId": 10,
    "orderStatusId": 8,
    "trackingCode": "237948723894789234",
    "comment": "Neuer Kommentar",
    "transactionId": "0",
    "clearedDate": "2019-10-18T17:58:17+0000"
}

http://shopware.dev.nos.to:8080/api/orders/15?XDEBUG_SESSION_START=PHPSTORM
with stock sample data.

Check the logs

Documentation:

N/A

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• All new and existing tests passed.
• I have assigned the correct milestone or created one if non-existent.
• I have correctly labeled this pull request.
• I have linked the corresponding issue in this description.
• I have updated the corresponding Jira ticket.
• I have requested a review from at least 2 reviewers
• I have checked the base branch of this pull request
• I have checked my code for any possible security vulnerabilities