fix(terminal): whichkey -> which-key (#2380)

lua/lvim/core/terminal.lua

@@ -88,7 +88,7 @@ M.add_exec = function(opts)
     term_mode = { [opts.keymap] = exec_func },
   }
 
-  local wk_status_ok, wk = pcall(require, "whichkey")
+  local wk_status_ok, wk = pcall(require, "which-key")
   if not wk_status_ok then
     return
   end