Widget types in "Add Widget" dropdown on layers page aren't displayed in any useful order

[rwawr]

Describe the bug

On the Edit Widgets and Layers page under Design > Widgets in the admin panel, when clicking the "Add Widget" button in any zone, the list of widgets is displayed in whatever order happens to be returned from the call to ContenteDefinitionManager.ListTypeDefinitionsAsync, whereas the list is ordered alphabetically by DisplayName when adding a widget to a flow part (code in FlowPart.Edit.cshtml). It would be much easier to find a desired widget type if the list were ordered alphabetically on the Edit Widgets and Layers page as well. I imagine that would just be a one-line change in OrchardCore.Layers.Views.Admin.Index.cshtml, which I'm happy to submit a PR for.

Orchard Core version

To Reproduce

• Go to the Edit Widgets and Layers page under Design > Widgets in the admin panel
• Click the Add Widget button
• Observe that widgets are not ordered by display name

Expected behavior

Widgets should be ordered by display name

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