Update mikutter to 3.0.8.

3.0.8
* Fixes Twitpci preview
* Fixes issue display Error icon instead of tab name with missing icon setting
  for the extract tab.
* Insane mikutter on Android
3.0.7
* Add workaround for Twitpic end.
* Add d250g2.com support
* Fixes API bug
* Update translations.

(obache)