BitmapFont !x1 resolution bug!

This reproduces https://github.com/pixijs/pixi.js/issues/5171

by ShukantPal

HTML

<script src="https://pixijs.download/v5.2.1/pixi.min.js"></script>
<canvas id="demo"></canvas>

JavaScript

const app = new PIXI.Application({
  view: document.getElementById('demo'),
  width: 512,
  height: 512,
  backgroundColor: 0xFFFFFF
});

app.loader.add('http://www.filedropper.com/arial50_1');
app.loader.load(() => {
	app.stage.addChild(new PIXI.BitmapText("123456", {
  	font: "arial50_1"
  }))
});