Refactor flux_helpers.py to add cleanup in finally block

modules/helpers/flux_helpers.py

@@ -119,9 +119,9 @@ def gen_img(request: BaseReq | BaseImg2ImgReq | BaseInpaintReq):
         if request.refiner:
             images = refiner(image=images, prompt=request.prompt, num_inference_steps=40, denoising_start=0.7).images
 
-        cleanup(pipeline, request.loras)
-
         return images
     except Exception as e:
         cleanup(pipeline, request.loras)
         raise gr.Error(f"Error: {e}")
+    finally:
+        cleanup(pipeline, request.loras)