Make ImageData(Uint8ClampedArray)'s 3rd param optional (#34519)

It can be inferred from the first two.

Fixes #33266

Baseline update from microsoft/TypeScript-DOM-lib-generator#790

Author: sandersn

src/lib/dom.generated.d.ts

@@ -9762,7 +9762,7 @@ interface ImageData {
 declare var ImageData: {
     prototype: ImageData;
     new(width: number, height: number): ImageData;
-    new(array: Uint8ClampedArray, width: number, height: number): ImageData;
+    new(array: Uint8ClampedArray, width: number, height?: number): ImageData;
 };
 
 interface InnerHTML {

src/lib/webworker.generated.d.ts

@@ -2202,7 +2202,7 @@ interface ImageData {
 declare var ImageData: {
     prototype: ImageData;
     new(width: number, height: number): ImageData;
-    new(array: Uint8ClampedArray, width: number, height: number): ImageData;
+    new(array: Uint8ClampedArray, width: number, height?: number): ImageData;
 };
 
 /** This Channel Messaging API interface allows us to create a new message channel and send data through it via its two MessagePort properties. */