palau.ruleset: Do not list "President" as an non-standard title
"President" is the default title for a Republic. palau.ruleset should not list it as a non-default one. Currently it causes the title to unnecessarily appearing in the nations domain strings to translate.
"President" is the default title for a Republic. palau.ruleset should not list it as a non-default one. Currently it causes the title to unnecessarily appearing in the nations domain strings to translate.