refactor(image): rename input image parameter key

- [refactor] Change "input_image" key to "image" in generation_params (image_handler.py:generate_image_to_image():194)

image_handler.py

@@ -192,7 +192,7 @@ def generate_image_to_image(
         
         # Prepare generation parameters
         generation_params = {
-            "input_image": input_image,
+            "image": input_image,
             "prompt": prompt,
             "num_inference_steps": num_inference_steps,
             "guidance_scale": guidance_scale,