chore(icons): remove duplicate declaration

Author: cameronr

lua/opencode/ui/icons.lua

@@ -80,8 +80,6 @@ local presets = {
 
 local deprecated_warning_shown = false
 
-local deprecated_warning_shown = false
-
 ---Get icon by key, honoring preset and user overrides
 ---@param key string
 ---@return string