fix(aws): restore accidentally deleted variable

Closes #11589

plugins/aws/aws.plugin.zsh

@@ -197,6 +197,7 @@ compctl -K _aws_profiles asp acp aws_change_access_key
 # AWS prompt
 function aws_prompt_info() {
   local _aws_to_show
+  local region="${AWS_REGION:-${AWS_DEFAULT_REGION:-$AWS_PROFILE_REGION}}"
   if [[ -n $AWS_PROFILE ]];then
     _aws_to_show+="${ZSH_THEME_AWS_PROFILE_PREFIX:=<aws:}${AWS_PROFILE}${ZSH_THEME_AWS_PROFILE_SUFFIX:=>}"
   fi
@@ -211,7 +212,6 @@ if [[ "$SHOW_AWS_PROMPT" != false && "$RPROMPT" != *'$(aws_prompt_info)'* ]]; th
   RPROMPT='$(aws_prompt_info)'"$RPROMPT"
 fi
 
-
 # Load awscli completions
 
 # AWS CLI v2 comes with its own autocompletion. Check if that is there, otherwise fall back