chore(secrets): support table of string (#500)

Signed-off-by: Aaron Pham <contact@aarnphm.xyz>

lua/avante/utils/init.lua

@@ -317,7 +317,7 @@ end
 ---@param msg string|string[]
 ---@param opts? LazyNotifyOpts
 function M.warn(msg, opts)
-  if require("avante.config").options.silent_warning then return end
+  if require("avante.config").silent_warning then return end
 
   opts = opts or {}
   opts.level = vim.log.levels.WARN