feat!: replace the Nerd Font hourglass icon for waiting state

why breaking: some configurations may rely on output parsing. this
update breaks the hacks that replace the hourglass icon in unpredicted,
custom ways.

lua/jj-log/init.lua

···
 local M = {}
 
 local defaults = {
-  out_waiting = "󰔟",
+  out_waiting = "...",
   out_no_jj_repo = "~no_jj_repo~",
   out_no_desc = "~no_desc~",
   max_desc_length = 47,