fix(config): fix duplicate migration logic

This was checking a `Version` object against a `MigrationEntry`, but what we want is to check the version object against `MigrationEntry.from_version`

invokeai/app/services/config/config_migrate.py

@@ -36,7 +36,7 @@ class ConfigMigrator:
         """Define a decorator which registers the migration between two versions."""
 
         def decorator(function: MigrationFunction) -> MigrationFunction:
-            if from_version in cls._migrations:
+            if any(from_version == m.from_version for m in cls._migrations):
                 raise ValueError(
                     f"function {function.__name__} is trying to register a migration for version {str(from_version)}, but this migration has already been registered."
                 )