fix: simplify settingspage

src/pages/SettingsPage/index.tsx

@@ -14,13 +14,10 @@ type SettingsPageProps = {
 
 export default function SettingsPage(props: SettingsPageProps) {
   function changeTheme(event: ChangeEvent<HTMLInputElement>, value: string) {
-    localStorage.setItem('theme', value);
-    if (Object.prototype.hasOwnProperty.call(themes, value)) {
     const theme = value as keyof typeof themes;
     props.setTheme(themes[theme]);
     props.setThemeName(theme);
   }
-  }
   return (
     <Popup title="Settings" open={props.open} onClose={props.onClose} maxWidth="sm">
       <ThemeRadioGroup onChange={changeTheme} themeName={props.themeName} />