Fix tabufline, auto ft=diff on diffview, add diff highlight syntax + lua tabstop=2

lua/configs/diffview.lua

@@ -1 +1,11 @@
-return {}
+return {
+  hooks = {
+    diff_buf_read = function(_)
+      vim.opt_local.wrap = false
+      vim.opt_local.list = false
+    end,
+    view_opened = function(_)
+      vim.api.nvim_command "set ft=diff"
+    end,
+  },
+}