net-im/mikutter: Update to 4.0.4
While here,
- Always use system ruby even if devel/rbenv is installed
Relnotes: https://mikutter.hatenablog.com/entry/2019/12/25/001520
https://mikutter.hatenablog.com/entry/2020/01/01/124344 https://mikutter.hatenablog.com/entry/2020/01/05/194602 https://mikutter.hatenablog.com/entry/2020/01/12/184122 https://mikutter.hatenablog.com/entry/2020/02/01/173247