No Default Position When Adding Component

Steps to reproduce

1.  Create a new campaign and add an new creative item
2.  Open the item for editing and add a component

Expected results

• The new component dialog is displayed with a default selected in the add before/after radio button group. This assumption is based on the behaviour of the Pages app which defaults to "after".

Actual results

• There is no default. Validation will force the user to select before or after.

Workaround

• One can define a new dialog and override the definition of the action addComponent found in campaign-manager/includes/apps/campaign-manager-app-detail-actions.yaml

Development notes

• The dialog is from pages-app. ie

{{addComponent:
$type: openDialogAction
dialogId: pages-app:newComponent
icon: icon-add-item
availability:
rules:
addible:
class: info.magnolia.pages.app.detail.action.availability.IsAreaAddibleRuleDefinition}}

This uses the old v5 UI. Swapping to the v6 dialog from pages (note: not pages-app) produces an error because of the datasource used in the background.