[neovim] fix indentation and add cursor theme

nix/home/neovim/neovim.nix

@@ -53,6 +53,7 @@
       vim.opt.backspace  = '2'
       vim.opt.laststatus = 2
       vim.opt.cursorline = true
+      vim.opt.guicursor= { 'a:hor20-Cursor/lCursor' }
 
       -- set scrolloff
       vim.opt.scrolloff = 10
@@ -66,9 +67,9 @@
 
       -- vim leave function
       vim.api.nvim_create_autocmd({ "VimLeave" }, {
-	callback = function()
-	  vim.cmd('set guicursor=a:hor20-Cursor/lCursor')
-	end,
+        callback = function()
+          vim.cmd('set guicursor=a:hor20-Cursor/lCursor')
+        end,
       })