[Scripts] Only show email changed section if it was changed

Show the email section when the email has changed instead of when the
name has changed in the git setup script.

scripts/setup-git.sh

@@ -73,7 +73,7 @@ EOF
       via 'git config --global user.name "$name"
 EOF
 
-[ -n "$name" ] \
+[ -n "$email" ] \
   && cat 1>&2 <<EOF
 
     Your email has been set to: $email