Removed flake8_nb directive from notebook.

The notebook repository does not use flake8_nb for linting,
so removed the noqa directive which is identified as a spelling
mistake by our spellchecker.

Author: zivy

Python/01_Image_Basics.ipynb

@@ -25,7 +25,7 @@
     "# Setup to enable running the notebook in the Google Colab environment\n",
     "\n",
     "try:\n",
-    "    import google.colab  # noqa: F401\n",
+    "    import google.colab\n",
     "    import pathlib\n",
     "\n",
     "    repo_dir = pathlib.Path(\"SimpleITK-Notebooks\")\n",