Revert "Not sure if this actually changes anything but it can't hurt."

This reverts commit 34608de2e9.

comfy/ldm/flux/controlnet_xlabs.py

@@ -64,8 +64,8 @@ class ControlNetFlux(Flux):
         img = img + controlnet_cond
         vec = self.time_in(timestep_embedding(timesteps, 256))
         if self.params.guidance_embed:
-            vec.add_(self.guidance_in(timestep_embedding(guidance, 256)))
-        vec.add_(self.vector_in(y))
+            vec = vec + self.guidance_in(timestep_embedding(guidance, 256))
+        vec = vec + self.vector_in(y)
         txt = self.txt_in(txt)
 
         ids = torch.cat((txt_ids, img_ids), dim=1)