fix: remove duplicated code in TemporalBasicTransformerBlock. (huggingface#7212)

fix: remove duplicate code in TemporalBasicTransformerBlock.

Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>

Author: AsakusaRinne

src/diffusers/models/attention.py

@@ -440,7 +440,6 @@ def __init__(
 
         # Define 3 blocks. Each block has its own normalization layer.
         # 1. Self-Attn
-        self.norm_in = nn.LayerNorm(dim)
         self.ff_in = FeedForward(
             dim,
             dim_out=time_mix_inner_dim,