fix: correct clip_txt_pool variable name typo

[Mr-Neutr0n]

Bug

In modules/stage_c.py, the gen_c_embeddings method unsqueezes clip_txt_pooled into a new variable clip_txt_pool when the tensor is 2D (line 158). However, the subsequent mapper call on line 161 still uses the original clip_txt_pooled — meaning the unsqueeze result is silently discarded.

This is inconsistent with how clip_img is handled two lines below, where clip_img = clip_img.unsqueeze(1) correctly updates the same variable that is then passed to clip_img_mapper.

Fix

Changed clip_txt_pool = clip_txt_pooled.unsqueeze(1) to clip_txt_pooled = clip_txt_pooled.unsqueeze(1) so the unsqueezed tensor is actually used by clip_txt_pooled_mapper, matching the clip_img pattern.