[neovim] Use default vim-slime config without prompt.

.vimrc

@@ -110,6 +110,7 @@ call plug#end()
 " vim-slime settings for use in tmux
 :let g:slime_target="tmux"
 :let g:slime_default_config={"socket_name": "default", "target_pane": "{last}"}
+:let g:slime_dont_ask_default=1
 :nnoremap <C-c><C-c> <Plug>SlimeParagraphSend
 :nnoremap <S-CR> <Plug>SlimeParagraphSend
 :xnoremap <C-c><C-c> <Plug>SlimeRegionSend