Bug/pdf viewer

[davidjgonzalez]

Fixes #1180

The problem was the viewer.js was included before the registration of the eventlistener, so sometimes the viewer.js would process and emit the event, before the following code could register the listener.

Move the viewer.js before the event registration to fix.

Related Issue

Motivation and Context

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.