languages/nix: remove hardcoded indentation options

[NotAShelf]

Removes the hardcoded 2-wide indentation from Nix filetype. To replicate previous behaviour, user must consolidate indentation behaviour to the Editorconfig configuration, or use autocommands in raw lua configuration.

Example:

vim.api.nvim_create_autocmd("FileType", {
  pattern = "nix",
  callback = function(opts)
  	local bo = vim.bo[opts.buf]
  	bo.tabstop = 2
  	bo.shiftwidth = 2
  end
 })

While feedback for this "sane" default has been mostly positive, nvf has no place setting opinionated defaults that are difficult to override. Fixes #564

[github-actions]

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Debug Information

Triggered by: NotAShelf

HEAD at: no-buffer-specific-opts

Reruns: 82

[github-actions]

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