removed forgotten drupal/domain dependend config files

config/install/field.field.user.user.field_domain_admin.yml

@@ -1,21 +0,0 @@
-langcode: en
-status: true
-dependencies:
-  config:
-    - field.storage.user.field_domain_admin
-  module:
-    - user
-id: user.user.field_domain_admin
-field_name: field_domain_admin
-entity_type: user
-bundle: user
-label: 'Domain administrator'
-description: 'Select the domains this user may administer.'
-required: false
-translatable: false
-default_value: {  }
-default_value_callback: ''
-settings:
-  handler: 'domain:domain'
-  handler_settings: {  }
-field_type: entity_reference

config/install/field.storage.user.field_domain_admin.yml

@@ -1,19 +0,0 @@
-langcode: en
-status: true
-dependencies:
-  module:
-    - domain
-    - user
-id: user.field_domain_admin
-field_name: field_domain_admin
-entity_type: user
-type: entity_reference
-settings:
-  target_type: domain
-module: core
-locked: false
-cardinality: -1
-translatable: true
-indexes: {  }
-persist_with_no_fields: false
-custom_storage: false