Images in test runs not rendered in Document Generator exports

Description
When exporting images in test runs using document generator, the images are not rendered correctly.

Preconditions

• Create a test run for a manual test with steps.
• Include at least one image in the steps.
• Add a global and a step evidence image.

Steps to Reproduce

1. Add the provided template to Xray's Document Generator (template attached).
2. Navigate to the test execution where the test was run.
3. Export the test execution using the Document Generator.

Actual Result / Attachments

• Images are displayed as broken/error images.
  

Expected Result

• Images should be rendered correctly in the exported document.