Werk #11185: Removed option to configure 'customer' in default_user_profile

Prevously, you could configure the 'customer' entry for the default user profile in global or site specific configuration of a site. This option was removed because the standard user profile should always have the customer of the site in question.

If you have used the rule "Default user profile" in global settings or site specific global settings before, please update the configuration files as follows:

• If you just configured an explicit customer before, please use "reset to default" once
• If you have used one of the other configuration options like "User role", please save the rule again

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