fix(Load manager): fixed the downloaded bytes onProgress call

[divya-sea]

Overview

This change contains fix for showing asset bytes downloading status. Initially we were hardcoding it to 0. Now are calculating based on downloaded and already loaded bytes.

Verifying Changes

Scene Composer

For scene-composer package changes specifically, you can preview the component in the published storybook artifact. To do this, wait for the Publish Storybook action to complete below.

• Click on the workflow details
• Select the Summary item on the left
• Download the zip file

To run the storybook build locally, you need a local static web server:

npm install -g httpserver
cd <Extracted Zip Directory>
httpserver

Then open the website http://localhost:8080 to run the doc site.

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