Address flake8 error.

Author: RyanJDick

invokeai/backend/ip_adapter/attention_processor.py

@@ -6,7 +6,6 @@
 import torch
 import torch.nn as nn
 import torch.nn.functional as F
-from diffusers.models.attention_processor import AttnProcessor as DiffusersAttnProcessor
 from diffusers.models.attention_processor import AttnProcessor2_0 as DiffusersAttnProcessor2_0