Load Venia loading indicator (logo.svg) via CSS

[laurentiumagureanu]

Description

Loading image (logo.svg) should be loaded from the site theme client lib.

Related Issue

CIF-1427

Motivation and Context

The logo.svg is hard coded in https://github.com/adobe/aem-core-cif-components/blob/master/react-components/src/components/LoadingIndicator/indicator.js

How Has This Been Tested?

Manually

Screenshots (if appropriate):

Types of changes

• [x] 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:

• [x] I have signed the Adobe Open Source CLA.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes and the overall coverage did not decrease.
• [x] All unit tests pass on CircleCi.
• [x] I ran all tests locally and they pass.