Fix remote image URLs in carrier_data.py

[Crissov]

• NTT Docomo
• Softbank

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

:memo: Please visit https://cla.developers.google.com/ to sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

---

• If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Check your existing CLA data and verify that your email is set on your git commits.
• If you signed the CLA as a corporation, please let us know the company's name.

[Crissov]

I signed the CLA.

[googlebot]

CLAs look good, thanks!

[markusicu]

Thanks -- Looks fine, and spot-checking the URLs indicates that they work. Just note that this project basically only exists as a historical record of what we used for Unicode 6.

[Crissov]

Thank you. Iʼm aware that this project has reached its goals and is now closed, but for those of us who are interested in the history of emoji it is an invaluable resource.