Update the OAuth Token user name

[icornejo]

Hi;

I made a mistake when I initially signed onto bitbucket for work. The user name I signed up with was incorrect. I should have used my "work" username.

This is now causing some issues when I use bitbucket and sourcetree, because sometimes I use GIT using the command line, and it's using my "work" username, vs. the username in source tree.

I've tried adding a new authentication, but it won't let me type in a new username.

How do fix this issue?

Thanks!