Change rcirc key-bindings

[luxbock]

The rcirc layer currently uses C-k and C-j to scroll between prev/next input from history. It's also one of the modes that start out in emacs-state by default. This results in us overwriting one of the most used Emacs bindings, C-k for kill-line, which is useful for deleting messages that we changed our mind about while typing.

I suggest changing these to M-k and M-j to avoid this conflict. I'll create a pull-request here but figured I should file an issue as well just for the record.

[syl20bnr]

I see. C-k C-j should be associated to insert state only.
The default state should be normal in vim style and emacs in emacs style.

[StreakyCobra]

This issue has been solved long ago by the PR #1009, and it's already in master, so closing it.