Widgets in area not updated when you change the page type

## To Reproduce

Step by step instructions to reproduce the behavior:

> 1. Create a new page
> 2. Click in add content to the main area
> 3. It shows the available widgets (rich text, image, video)
> 4. Change from default type to home type
> 5. Click in add content on the main area, it shows the same widgets
> 4. See error

## Expected behavior
> When you change to the home type it should only show the rich text widget in the main area

## Describe the bug
> The widgets available in an area are not updated when you change the page type

## Details

**Version of Node.js:**
v16.16

**Server Operating System:**
Ubuntu 20

**Video reproducing issue**

https://user-images.githubusercontent.com/26570009/219337895-46e876a6-edf5-49d8-b85e-59f6e00831d9.mp4

**Code**
https://github.com/ecb34/A3-area-bug

The project is the same as the boilerplate repository, only removing the image and video widget options for the home page main area

Start by reproducing the issue with the linked A3-area-bug project and trace the page-type change and main-area widget selection in the Apostrophe application. Done means changing from the default type to the home type refreshes the available widgets so only rich text appears in the main area.

Written by the indexing model from the issue text.