[tutorial] fixed missing RIR scripts file. (#8257)

Signed-off-by: Xuesong Yang <[email protected]>

tutorials/asr/Online_Noise_Augmentation.ipynb

@@ -752,8 +752,9 @@
             "source": [
                 "# This is where the rir data will be downloaded.\n",
                 "# Change this if you don't want the data to be extracted in the current directory.\n",
+                "!wget https://raw.githubusercontent.com/NVIDIA/NeMo/$BRANCH/scripts/dataset_processing/get_openslr_rir_data.py\n",
                 "rir_data_path = '.'\n",
-                "!python ../../scripts/dataset_processing/get_openslr_rir_data.py --data_root {rir_data_path}\n",
+                "!python get_openslr_rir_data.py --data_root {rir_data_path}\n",
                 "rir_manifest_path = os.path.join(rir_data_path, 'processed', 'rir.json')\n",
                 "!head -n 3 {rir_manifest_path}"
             ]