Fixed issue with LLM accuracy tests (#28922)

Author: AlexKoff88

tests/llm/accuracy_conformance.py

@@ -49,7 +49,7 @@ def init_test_scope():
         tokenizer.save_pretrained(model_path)
 
         ov_model = OVModelForCausalLM.from_pretrained(model_path, load_in_8bit=True)
-        ov_model_path = model_path = os.path.join(tmp_dir, model_type + "_ov")
+        ov_model_path = model_path + os.path.join(tmp_dir, model_type + "_ov")
         ov_model.save_pretrained(ov_model_path)
         tokenizer.save_pretrained(ov_model_path)
         del ov_model