fix: Order of the ZIP code and city field

[aragon999]

1. Why is this change necessary?

https://forum.shopware.com/t/im-registrierungsformular-steht-ort-vor-plz/103671/4
46ee060#diff-bec516e908622f4a6c0862196e64e5a62997373658b915cd3153f73fd04253ff

2. What does this change do, exactly?

Interchange the order and for good measure, also add blocks.

3. Describe each step to reproduce the issue or behaviour.

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4. Please link to the relevant issues (if any).

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5. Checklist

• I have rebased my changes to remove merge conflicts
• I have written tests and verified that they fail without my change
• I have created a changelog file with all necessary information about my changes
• I have written or adjusted the documentation according to my changes
• This change has comments for package types, values, functions, and non-obvious lines of code
• I have read the contribution requirements and fulfil them.

[aragon999]

Maybe the "fix" is not sufficient, as it has been pointed out, that for some countries it might be needed that the order is reversed. Not sure if the configuration option should be added again (and if so, at which place?).

[mstegmeyer]

Just swapping the fields is not the solution, I believe. We should either bring back the option that was removed due to the new address formatting or apply the new address formatting to the registration form as well (difficult, due to the country selection being at the end).