nvim: keymappings: Fix the sudo write command

We actually haven't tested this.
https://dev.to/jovica/the-vim-trick-which-will-save-your-time-and-nerves-45pg

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/.config/nvim/keymappings.vim

@@ -1,5 +1,5 @@
 " Allow saving of files as sudo when I forgot to start vim using sudo
-cmap w!! w !sudo tee > /dev/null %
+cnoremap w!! execute 'silent! write !sudo tee % >/dev/null' <bar> edit!
 " Remap escape keys to something usable on home row
 inoremap jk <Esc>
 cnoremap jk <C-C>