Fix ControlNetUnit legacy field alias (#2860)

internal_controlnet/args.py

@@ -292,7 +292,7 @@ class ControlNetUnit(BaseModel):
         for alias, key in ext_compat_keys.items():
             if alias in values:
                 assert key not in values, f"Conflict of field '{alias}' and '{key}'"
-                values[key] = alias
+                values[key] = values[alias]
                 cls.cls_logger.warn(
                     f"Deprecated alias '{alias}' detected. This field will be removed on 2024-06-01"
                     f"Please use '{key}' instead."

unit_tests/args_test.py

@@ -239,3 +239,7 @@ def test_infotext_parsing():
         pixel_perfect=True,
         control_mode="Balanced",
     ) == ControlNetUnit.parse(infotext)
+
+
+def test_alias():
+    ControlNetUnit.from_dict({"lowvram": True})