[V3] convert nodes_model_downscale.py to V3 schema

[bigcat88]

Node was tested after conversion:

Objects git diff:

diff --git a/v3_object_info.json b/master_object_info.json
index c82328e..90cdc34 100644
--- a/v3_object_info.json
+++ b/master_object_info.json
@@ -8761,8 +8761,7 @@
         "input": {
             "required": {
                 "model": [
-                    "MODEL",
-                    {}
+                    "MODEL"
                 ],
                 "block_number": [
                     "INT",
@@ -8807,30 +8806,22 @@
                     }
                 ],
                 "downscale_method": [
-                    "COMBO",
-                    {
-                        "multiselect": false,
-                        "options": [
-                            "bicubic",
-                            "nearest-exact",
-                            "bilinear",
-                            "area",
-                            "bislerp"
-                        ]
-                    }
+                    [
+                        "bicubic",
+                        "nearest-exact",
+                        "bilinear",
+                        "area",
+                        "bislerp"
+                    ]
                 ],
                 "upscale_method": [
-                    "COMBO",
-                    {
-                        "multiselect": false,
-                        "options": [
-                            "bicubic",
-                            "nearest-exact",
-                            "bilinear",
-                            "area",
-                            "bislerp"
-                        ]
-                    }
+                    [
+                        "bicubic",
+                        "nearest-exact",
+                        "bilinear",
+                        "area",
+                        "bislerp"
+                    ]
                 ]
             }
         },
@@ -8855,18 +8846,12 @@
         "output_name": [
             "MODEL"
         ],
-        "output_tooltips": [
-            null
-        ],
         "name": "PatchModelAddDownscale",
         "display_name": "PatchModelAddDownscale (Kohya Deep Shrink)",
         "description": "",
         "python_module": "comfy_extras.nodes_model_downscale",
         "category": "model_patches/unet",
-        "output_node": false,
-        "deprecated": false,
-        "experimental": false,
-        "api_node": false
+        "output_node": false
     },
     "ImageCrop": {
         "input": {

[bigcat88]

+label: Core

[Kosinkadink]

Node authors notified, will merge on Wednesday October 8th with the rest of the scheduled V3 PR batch.