use spaces for elixir

Signed-off-by: Christoph Schmatzler <christoph@schmatzler.com>

modules/home/neovim/autocmd.nix

@@ -23,6 +23,12 @@
 				pattern = "*";
 				command = "normal zR";
 			}
+			{
+				event = "FileType";
+				group = "Christoph";
+				pattern = "*.ex,*.exs,*.heex";
+				command = "setlocal expandtab tabstop=2 shiftwidth=2 softtabstop=2";
+			}
 		];
 	};
 }