[Bugfix] Fix character encoding issue

[NoftScarlet]

Description

Trello
To fix this issue, I updated the code based on what was change in this PR for fixing the same issue.

To verify

https://ychen-hosted-envs.web.app/pdfjs-encoding/

Steps the above demo was created (and I hope they are correct):

1. Copy the changed files from this repo into webviewer repo src/pdfjs/src/src & replace the files there
2. npm run build-pdfjs-workers
3. npm run build-pdfjs
4. npm run host-env-build

API change discussion link

No changes to API

UI/UX change discussion link

No changes to UIUX

Effect on pdf.js express

This fixes a pdfjs specific issue

Checklist

• Added jsdoc comments for newly exposed APIs
• Added @method in the jsdoc comments for newly exposed functions, e.g. @method Core.AnnotationManager#exportAnnotations
• Double checked spelling and grammar in jsdoc comments
• Used square brackets around property names where it is necessary (Object properties from user provided parameters, properties that are defined with quotes in Object.defineProperties)
• When using innerHTML or dangerouslySetInnerHTML double checked they are actually needed and if they are needed, that user data is sanitized
• Tests are not available to pdfjs express
• If PR contains any UI, visual updates, generate a link (npm run host-env) and send it over Xodo to Carolyn Chen (@caroly) or Joshua Sun (@JoshuaSun) for review.

Related issues

pdfjs express community topic link