Fixed rendering of the image blobs

What does this MR do?

The MR fixes the rendering of the image blobs in WebIDE. Contrary to the scenario when we open an existing image in WebIDE (and the image has the real URL), the newly-uploaded images do not have such URL yet. Instead, they are rendered with a blob: URL. In this case, encoding such URL alters it so that the image is not viewable anymore.

This MR solves this issue.

Screenshots (strongly suggested)

Before	After

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have included a changelog entry.
  • I have not included a changelog entry because _____.
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Related to #325864 (closed)