Fix Google Drive URL to avoid Virus scan warning

[albertvillanova]

This PR fixes, in the datasets library instead of in every specific dataset, the issue of downloading the Virus scan warning page instead of the actual data file for Google Drive URLs.

Fix #3786, fix #3784.

[AngadSethi]

Thanks for this @albertvillanova!

[albertvillanova]

Once this PR merged into master and until our next datasets library release, you can get this fix by installing our library from the GitHub master branch:

pip install git+https://github.com/huggingface/datasets#egg=datasets

Then, if you had previously tried to load the data and got the checksum error, you should force the redownload of the data (before the fix, you just downloaded and cached the virus scan warning page, instead of the data file):

load_dataset("...", download_mode="force_redownload")

[tscholak]

Thanks, that solved a bunch of problems we had downstream!
cf. ServiceNow/picard#61