[v19] showcase for datepicker-sizes-demo has wrong ts

[jjs98]

I guess this is a copy paste waste :D

import { Component } from '@angular/core';
import { DatePicker } from 'primeng/datepicker';
import { FormsModule } from '@angular/forms';

@component({
selector: 'datepicker-basic-demo',
templateUrl: './datepicker-basic-demo.html',
standalone: true,
imports: [FormsModule, DatePicker]
})
export class DatePickerBasicDemo {
value1: Date | undefined;

value2: Date | undefined;

value3: Date | undefined;

}