Add update video to v1.43.0 changelog

Author: Hexagonl

data/changelog.yml

@@ -1910,5 +1910,4 @@
       The "enhanced clean up tool" addon, previously part of "developer tools", can now be toggled separately in Scratch Addons settings. You can also choose whether to remove unused variables and lists.
 
       Other new features in this update are new settings for "Scratch 3.0 → 2.0" and "full areas" and improved support for mobile devices.
-    ImagePath: /assets/img/release-highlights/cleanup-plus.png
-    ImageAlt: Screenshot of the code area context menu with the "Clean up Blocks +" option highlighted.
+    YouTubeID: -kAPVFcbcgs