Update abuse_reports.js.es6 with prettier `window.gl` assignment

What does this MR do?

Update abuse_reports.js.es6 with prettier window.gl assignment provided by @selfup

Very small change but marks the beginning of some frontend guidelines I will soon create.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

What are the relevant issue numbers?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together