[https://nvbugs/5430124][fix] Mistral mixture_text_image test case fix (NVIDIA#6648)

Signed-off-by: yechank <[email protected]>

Author: yechank-nvidia

tests/integration/defs/test_e2e.py

@@ -2165,8 +2165,8 @@ def test_ptp_quickstart_multimodal(llm_root, llm_venv, model_name, model_path,
                 "Describe the scene in the image briefly.",
             ],
             "media": [
-                [],
-                [str(test_data_root / "inpaint.png")],
+                "",
+                str(test_data_root / "inpaint.png"),
             ],
         }
     }
@@ -2226,7 +2226,7 @@ def test_ptp_quickstart_multimodal(llm_root, llm_venv, model_name, model_path,
             ],
             "mixture_text_image":
             [["invention", "person", "scientists", "Lick", "engineers"],
-             ["landscape", "dome", "yosemite", "altitude", "scattered"]]
+             ["landscape", "trees", "road", "natural", "rock"]]
         },
         "gemma-3-27b-it": {
             "image": [