This is a regression from PR #4615. The underscore for the last 2 chars in "NUMERO D’IMMATRICULATION" is too bold.

URL: http://www.ameli.fr/fileadmin/user_upload/formulaires/S3706.pdf
1.1.215: https://i.imgur.com/up8Y33j.png
0.8.990: https://i.imgur.com/UioZcLB.png

fc1e2483b433134a538cce0acd0ccc76e335cf5f is the first bad commit
commit fc1e2483b433134a538cce0acd0ccc76e335cf5f
Author: Jonas Jenwald
Date:   Fri Apr 11 20:19:39 2014 +0200

```
Enforce minimum line widths
```

beginInlineImage: function CanvasGraphics_beginInlineImage() {
      unreachable("Should not call beginInlineImage");
    },
    beginImageData: function CanvasGraphics_beginImageData() {
      unreachable("Should not call beginImageData");
    },
    paintFormXObjectBegin: function CanvasGraphics_paintFormXObjectBegin(
      matrix,
      bbox
    ) {
      if (!this.contentVisible) {
        return;
      }
      this.save();
      this.baseTransformStack.push(this.baseTransform);
      if (Array.isArray(matrix) && matrix.length === 6) {
        this.transform.apply(this, matrix);
      }
      this.baseTransform = this.ctx.mozCurrentTransform;
      if (bbox) {
        const width = bbox[2] - bbox[0];
        const height = bbox[3] - bbox[1];
        this.ctx.rect(bbox[0], bbox[1], width, height);
        this.clip();
        this.endPath();
      }
    },
    paintFormXObjectEnd: function CanvasGraphics_paintFormXObjectEnd() {
      if (!this.contentVisible) {