Update the Azure Active Directory client ID

[olivierdagenais]

Manual testing

1. Deleted the credentials associated with a Visual Studio Team Services account.
2. Performed a git fetch.
3. The JavaFX-based web browser appeared (notice how it now says "Visual Studio Team Services"):
   
4. I completed the sign-in with 2-factor authentication.
5. The fetch completed.
6. I deleted the credentials again.
7. Performed a git fetch again.
8. The JavaFX-based web browser again appeared.
9. This time I closed the window. The GCM4ML fell back to Device Login mode and asked me to go to https://aka.ms/devicelogin and enter a user code.
10. I opened a browser and entered the user code (notice how it now says "Visual Studio Team Services"):
    
11. I completed the sign in.
12. The fetch completed.

Mission accomplished!

[davidstaheli]

Looks good!