When saving a structure via a structure block, the NBT file is placed in /structures instead of /structure

Steps to reproduce:

1. In a test world, save any structure using a structure block

2. In your computer’s file browser, navigate to [your Minecraft install folder]/saves/[name of your test world]/generated/[namespace of the structure you saved]/

3. You should see that the only subfolder that appears is named structures and that it contains the exported structure’s .nbt file

Expected result:

Structures should be saved in the [Minecraft install folder]/saves/[world]/generated/[namespace]/structure/ folder, because (as of snapshot 24w21a) data packs require structure .nbt files to be placed in the data/[namespace]/structure/ folder.

Actual result:

Structures are saved in the [Minecraft install folder]/saves/[world]/generated/[namespace]/structures/ folder, which can cause confusion when copying structures from the world’s folder into a work-in-progress data pack.