[Android/Kotiln] 태블릿판별, 태블릿 아닐 때만 세로 모드 고정

   fun isTablet(context: Context): Boolean {
        val xlarge = context.getResources().getConfiguration().screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK === Configuration.SCREENLAYOUT_SIZE_XLARGE
        val large = context.getResources().getConfiguration().screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK === Configuration.SCREENLAYOUT_SIZE_LARGE
        return xlarge || large
    } // 세로 모드 고정
    
    
    public override fun onCreate(savedInstanceState: Bundle?) {
        if(!isTablet(this)) {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT)
        }
    .....