[vim] Re-enable inline buffer error messages
[vim] Re-enable inline buffer error messages

This reverts 21505d74514fbdad804ca532aa0fa355aea65fa1.

This is inspired by reading
https://scattered-thoughts.net/writing/moving-faster/ and thinking about
how this would have been helpful when writing wanikani-apprentice.

rouge8/dotfiles,rouge8/dotfiles,rouge8/dotfiles