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">


if (!ignoreBorder && data.borderStyle.width > 0) {
      container.style.borderWidth = `${data.borderStyle.width}px`;
      if (data.borderStyle.style !== AnnotationBorderStyleType.UNDERLINE) {
        
        
        
        width = width - 2 * data.borderStyle.width;
        height = height - 2 * data.borderStyle.width;
      }
      const horizontalRadius = data.borderStyle.horizontalCornerRadius;
      const verticalRadius = data.borderStyle.verticalCornerRadius;
      if (horizontalRadius > 0 || verticalRadius > 0) {
        const radius = `${horizontalRadius}px / ${verticalRadius}px`;
        container.style.borderRadius = radius;
      }
      switch (data.borderStyle.style) {
        case AnnotationBorderStyleType.SOLID:
          container.style.borderStyle = "solid";
          break;
        case AnnotationBorderStyleType.DASHED:
          container.style.borderStyle = "dashed";
          break;
        case AnnotationBorderStyleType.BEVELED:
          warn("Unimplemented border style: beveled");
          break;
        case AnnotationBorderStyleType.INSET:
          warn("Unimplemented border style: inset");
          break;
        case AnnotationBorderStyleType.UNDERLINE:
          container.style.borderBottomStyle = "solid";