Update video.ipynb

removing "media_type=MediaType.Video" from dataset since this cause an error : 
InvalidAttributeError: Field(s) ''media_type'' not valid on DB type 'Dataset'("Field(s) ''media_type'' not valid on DB type 'Dataset'", None)

Author: paultancre

examples/annotation_import/video.ipynb

@@ -122,7 +122,7 @@
                 "# Lets setup a project to label\n",
                 "# Note see Ontology, Project, and Project_setup notebooks for more information on this section.\n",
                 "project = client.create_project(name=\"video_mal_project\", media_type=MediaType.Video)\n",
-                "dataset = client.create_dataset(name=\"video_mal_dataset\", media_type=MediaType.Video)\n",
+                "dataset = client.create_dataset(name=\"video_mal_dataset\")\n",
                 "dataset.create_data_row(\n",
                 "    row_data=\n",
                 "    \"https://storage.labelbox.com/cjhfn5y6s0pk507024nz1ocys%2Fb8837f3b-b071-98d9-645e-2e2c0302393b-jellyfish2-100-110.mp4\"\n",