Fix static urls in pdf_viewer.html to correctly display PDF viewer for textbooks

Description

Currently textbooks for a course are not loaded in i-frame. Reason is that browser cannot find the resources required to load the viewer. In file `/lms/templates/pdf_viewer.html`, all static urls e.g.

```
${static.url('/static/js/vendor/pdfjs/locale/locale.properties')}
```
have unnecessary `/static` in the beginning of paths, due to which, the viewer is not loaded correctly and textbooks are not displayed correctly.

So I have removed those unnecessary `/static`(s) from the source paths.

Assignee

Ned Batchelder

Reporter

Open Source Pull Request Bot

Contributor Name

Danial Malik

Repo

edx/edx-platform

Customer

None

Epic Link

None

OSCM Assignee

None

Platform Map Area (Levels 1 & 2)

Learner Experiences - Course Experience

Platform Map Area (Levels 3 & 4)

Learning Apps: Individual Support - Textbook App

Blended Hour Utilization Percentage

None

Priority

Unset
Configure