vimrc: Add <leader>sp mapping to toggle spell checking

One frustration that happens every so often is having to manually type
`:set spe<Tab><CR>` or `:set nosp<Tab><CR>` to turn spell checking on
and off. It's not often that I need to toggle spell checking, but when I
do, I notice it as being bothersome. I think it's finally time to add a
mapping for this.

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