Don't load OAuth Twitter library in Dæghrefn
Summary:
As Twitter support is removed from our IRC bots,
we don't need this library anymore.
Ref T1795
Test Plan: Ensure eggdrops start safely
Reviewers: dereckson
Reviewed By: dereckson
Maniphest Tasks: T1795
Differential Revision: https://devcentral.nasqueron.org/D2884