bugfix-substituteText type and setters

[joranbeasley]

made the setters actually setters (maybe it was my webpack... but it did not like having those without set)

fixed type for substituteText (it is a boolean flag)

MyClass.ts

import {TextInput} from 'pixi-textinput-v5'
import * as PIXI from 'pixi.js'

const app = new PIXI.Application({width:400,height:100})
const te = new TextInput({
    input: {
        fontSize: '12px',
        padding: '5px',
        width: '150px',
        color: '#26272E'
    },
    box: {
        default: {fill: 0xE8E9F3, rounded: 1, stroke: {color: 0xCBCEE0, width: 4}},
        focused: {fill: 0xE1E3EE, rounded: 2, stroke: {color: 0x8B8FD6, width: 4}},
        disabled: {fill: 0xDBDBDB, rounded: 2}
    }
});
te.placeholder = "Hello World"
te.substituteText = false;
te.position.x = 25;
te.position.y = 45;
app.stage.addChild(te);
document.body.onload = ()=> {
    document.body.appendChild(app.view)
}