Fix AuraFlow attn processors applying norm_added_q to key projection (#13533)
Both AuraFlowAttnProcessor2_0 and FusedAuraFlowAttnProcessor2_0 were
calling attn.norm_added_q on encoder_hidden_states_key_proj while
guarded by a check on attn.norm_added_k. This applies the query
normalization layer to the key, which is a copy-paste error.
Consistent with every other attention processor in this file that
defines both norm_added_q and norm_added_k (e.g. FluxAttnProcessor,
CogVideoXAttnProcessor, HunyuanAttnProcessor), where norm_added_k is
applied to the added key projection.