neovim: Prefer treesitter prisma over vim-prisma

vim-prisma currently has an issue where the syntax highlighting gets
messed up as one scrolls. The treesitter version doesn't have this
issue, which makes it more pleasing to work with.

home/neovim.nix

@@ -502,6 +502,7 @@ in
                   and lang ~= "nix"
                   and lang ~= "vue"
                   and lang ~= "pug"
+                  and lang ~= "prisma"
               end,
               additional_vim_regex_highlighting = true,
             },
@@ -522,7 +523,6 @@ in
       fzf-vim
       vim-caddyfile
       vim-graphql
-      vim-prisma
       vim-javascript
       vim-jsx-pretty
       csv-vim