Some PopupAnnotation trigger-areas are too small after PR 15036

[Snuffleupagus]

Attach (recommended) or Link to PDF file here: issue14105.pdf from the test-suite.

Configuration:

• Web browser and its version: N/A
• Operating system and its version: N/A
• PDF.js version: master, this is a regression from PR [api-minor] Get rid of CSS transform on each annotation in the annotation layer #15036
• Is a browser extension: N/A

Steps to reproduce the problem:

1. Open issue14105.pdf
2. Try to open a PopupAnnotation, by clicking on the appropriate element.

What is the expected behavior? (add screenshot)
That you can click on the entire element, please see red outline below:

What went wrong? (add screenshot)
You can only click on a small part of the element, please see red outline below:

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension): N/A

/cc @calixteman