Image Picker - Custom `imageitemvalue` property doesn't immediately appear in Choices collection editor

[JaneSjs]

UPDATED: "showModel" attribute should be set to "list".

Serializer.addProperty("imageitemvalue", {
  name: "imageId",
  displayName: "Image ID",
  type: "number",
  showModel: "list"
});

T15215 - add the field "Image ID" https://surveyjs.answerdesk.io/internal/ticket/details/T15215

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Usage Scenario: add an imageId field to Image Picker items. Modify the defaultJson definition of an Image Picker question to include a custom imageId property value.

Issue: a newly added Image Picker question doesn't display custom imageId property values. It is necessary to reopen a choice detail tab to refresh the UI and make the custom value appear.

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