[Rectangular movement] Fix the extension origin (#399)

* Don't show in changelog

Author: D8H

examples/rectangular-movement/rectangular-movement.json

@@ -6800,7 +6800,7 @@
       "shortDescription": "Move objects in a rectangular pattern.",
       "version": "1.0.0",
       "origin": {
-        "identifier": "RectangularMovement",
+        "identifier": "RectangleMovement",
         "name": "gdevelop-extension-store"
       },
       "tags": [