Update data_config.yaml

Making this change to account for coarsening which occurs spatially

data_config.yaml

@@ -21,8 +21,8 @@ input_data:
       - v100
       - u200
       - v200
-      nwp_image_size_pixels_height: 42
-      nwp_image_size_pixels_width: 42
+      nwp_image_size_pixels_height: 84
+      nwp_image_size_pixels_width: 84
       nwp_provider: ecmwf
       nwp_zarr_path: PLACEHOLDER.zarr
       time_resolution_minutes: 60