When the stored `commonAspectRatio` (e.g. `SquareHd`) isn't in the
newly-selected model's `aspectRatios`, `PopoverMenu` toggle mode found
no selected item and collapsed the trigger to icon-only.
Reset to `model.defaultAspectRatio` from inside `AspectRatioPicker` so
the fix applies to all three callers (image/edit/3D). Drops the
duplicate workaround from `PromptBox3D`.