Update level default & manifest

Author: jluethi

src/fractal_helper_tasks/__FRACTAL_MANIFEST__.json

@@ -76,10 +76,10 @@
             "description": "Name of the label to copy from 2D OME-Zarr to 3D OME-Zarr"
           },
           "level": {
-            "default": 0,
+            "default": "0",
             "title": "Level",
             "type": "string",
-            "description": "Level of the 2D OME-Zarr label to copy from"
+            "description": "Level of the 2D OME-Zarr label to copy from. Valid choices are \"0\", \"1\", etc. (depending on which levels are available in the OME-Zarr label)."
           },
           "tables_to_copy": {
             "items": {

src/fractal_helper_tasks/convert_2D_segmentation_to_3D.py

@@ -15,7 +15,7 @@
 def convert_2D_segmentation_to_3D(
     zarr_url: str,
     label_name: str,
-    level: str = 0,
+    level: str = "0",
     tables_to_copy: Optional[list[str]] = None,
     new_label_name: Optional[str] = None,
     new_table_names: Optional[list] = None,
@@ -186,7 +186,6 @@ def convert_2D_segmentation_to_3D(
             if table.type() == "roi_table" or table.type() == "masking_ROI_table":
                 for roi in table.rois():
                     roi.z_length = z_extent
-
             else:
                 # For some reason, I need to load the table explicitly before
                 # I can write it again