imp: add swiftmailer transport config

config/optional/core.entity_view_display.node.webform.default.yml

+langcode: en
+status: true
+dependencies:
+  config:
+    - field.field.node.webform.body
+    - field.field.node.webform.field_webform
+    - node.type.webform
+  module:
+    - text
+    - user
+    - webform
+id: node.webform.default
+targetEntityType: node
+bundle: webform
+mode: default
+content:
+  body:
+    weight: 0
+    label: above
+    settings: {  }
+    third_party_settings: {  }
+    type: text_default
+    region: content
+  field_webform:
+    type: webform_entity_reference_entity_view
+    weight: 1
+    region: content
+    label: above
+    settings:
+      source_entity: true
+    third_party_settings: {  }
+hidden:
+  langcode: true
+  links: true