Cannot delete a tree if the tree ID field is hidden.

[jwalgran]

• Create an instance named cant-delete-without-tree-id
• Browse http://localhost:6060/cant-delete-without-tree-id/management/field-configuration/
• Click "Edit"
• Uncheck "ID" in the "Tree" section.
• Click "Save"
• Click "Add a tree." Complete the add tree process, filling in a species and diameter.
• Browse the detail page for the tree
• Click "Delete" and "Confirm Deletion"

Expected: The tree is deleted and the planting site remains Actual: The API returns a 400 and the tree is not deleted.

This is where plotDetail.js is creating a delete URL by looking for the presence of the tree ID in the DOM.

https://github.com/OpenTreeMap/otm-core/blob/dc0428c468707a38ea41176204b527b1832e9a8d/opentreemap/treemap/js/src/lib/plotDetail.js#L31-L47

This is the root cause of https://github.com/OpenTreeMap/otm-clients/issues/439