fix indentation when puking up a linked list

updatedshmup.p8

@@ -310,10 +310,10 @@ function puke(item, indent, seen, hidekey)
  end
 
  if item.is_linked_list then
-  local ret,n = "linked_list <",0
+  local ret,n,xpfx = "linked_list <",0,pfx.." "
   item:strip(function(x)
    n += 1
-   ret ..= pfx..tostr(n)..": "..puke(x, indent+1, seen, "next")
+   ret ..= xpfx..tostr(n)..": "..puke(x, indent+1, seen, "next")
   end)
   return ret..pfx..">"
  end