Unwanted print in ModelMeta class

[proto3]

With the 0.3.4 release, model fields are being printed for no reason when declaring a new model class.

It seems an unwanted print was forgotten in there:
https://github.com/redis/redis-om-python/blob/main/aredis_om/model/model.py#L1326

[slorello89]

That was accidently left behind - removed in #687