fix: updateWysiwygStyle updatedElement is undefined TypeError (#4980)

Co-authored-by: dwelle <luzar.david@gmail.com>

src/scene/Scene.ts

@@ -62,8 +62,8 @@ class Scene {
     return this.nonDeletedElements;
   }
 
-  getElement(id: ExcalidrawElement["id"]): ExcalidrawElement | null {
-    return this.elementsMap.get(id) || null;
+  getElement<T extends ExcalidrawElement>(id: T["id"]): T | null {
+    return (this.elementsMap.get(id) as T | undefined) || null;
   }
 
   getNonDeletedElement(