Placeholder left align property needs fixing

[raphael-trzpit]

I had a problem when using a title placeholder in a master slide:

var pptx = new PptxGenJS();
pptx.defineSlideMaster({
  title: 'MASTER_SLIDE',
  objects: [
    { 'placeholder': {
        options: { name:'title', type:'title', x:0.6, y:1.5, w:12, h:5.25, align: 'left' },
        text: '(custom placeholder text!)'
      }
    }
  ]
});
pptx.addNewSlide('MASTER_SLIDE');
pptx.save();

When i open the file, the align property is not precised and the default behavior seems to be centered.
As the left case is ignored, i can't force it :(

[gitbrent]

Thanks @raphael-trzpit !