vim: ignore more spell files
vim: ignore more spell files

Neovim downloaded a couple more for me now, so let's ignore a little
more aggressively.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent