Attach (recommended) or Link to PDF file here:
https://drive.google.com/open?id=1UjLxnFw2g3gn3tvNLRYLdmG6mFdFKCcr

Configuration:
- Web browser and its version: Chrome 77.0.3865.90
- Operating system and its version: Mac mojave 10.14.6
- PDF.js version: 2.3.194
- Is a browser extension: Nope

Steps to reproduce the problem:
1. Make sure to set `renderInteractiveForms` to `true`
2. The read-only form field(Sample title) doesn't honor it's proper font-size

What is the expected behavior?
<img width="862" alt="write" src="https://user-images.githubusercontent.com/4616548/66152094-4a009a80-e64b-11e9-81dc-178068055efa.png">

What went wrong?
<img width="842" alt="wrong" src="https://user-images.githubusercontent.com/4616548/66152100-4d942180-e64b-11e9-91a8-ad9caf451f98.png">


constructor(params) {
    super(params);
    const dict = params.dict;
    const data = this.data;
    this.ref = params.ref;
    data.annotationType = AnnotationType.WIDGET;
    data.fieldName = this._constructFieldName(dict);
    data.actions = collectActions(params.xref, dict, AnnotationActionEventType);
    const fieldValue = getInheritableProperty({
      dict,
      key: "V",
      getArray: true,
    });
    data.fieldValue = this._decodeFormValue(fieldValue);
    const defaultFieldValue = getInheritableProperty({
      dict,
      key: "DV",
      getArray: true,
    });
    data.defaultFieldValue = this._decodeFormValue(defaultFieldValue);
    data.alternativeText = stringToPDFString(dict.get("TU") || "");
    const defaultAppearance =
      getInheritableProperty({ dict, key: "DA" }) ||