refactor: simplify listener declaration in OverlayPlugin demo

[sonarcloud[bot]]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions[bot]]

:recycle: PR Preview 249e459276e782d29ab52990e751d301dfd97b2c has been successfully destroyed since this PR has been closed.

_{🤖 By surge-preview}