able to be IM off with <Esc> on Normal mode
change imap <C-j> <Esc> mapping to map and lmap
Revert "change imap <C-j> <Esc> mapping to map and lmap"

This reverts commit 6e9dc56226759406c0841e3f8b64d91ebcecbb37.

https://github.com/vim-jp/issues/issues/282