Fix missing " in OffscreenRenderingContextId IDL

This was introduced in 8433bfc.

Author: domenic

source

@@ -65380,7 +65380,7 @@ dictionary <dfn>ImageEncodeOptions</dfn> {
   unrestricted double <span data-x="image-encode-options-quality">quality</span>;
 };
 
-enum <dfn>OffscreenRenderingContextId</dfn> { "<span data-x="offscreen-context-type-2d">2d</span>", "<span data-x="offscreen-context-type-bitmaprenderer">bitmaprenderer</span>, "<span data-x="offscreen-context-type-webgl">webgl</span>", "<span data-x="offscreen-context-type-webgl2">webgl2</span>" };
+enum <dfn>OffscreenRenderingContextId</dfn> { "<span data-x="offscreen-context-type-2d">2d</span>", "<span data-x="offscreen-context-type-bitmaprenderer">bitmaprenderer</span>", "<span data-x="offscreen-context-type-webgl">webgl</span>", "<span data-x="offscreen-context-type-webgl2">webgl2</span>" };
 
 [<span data-x="dom-OffscreenCanvas">Constructor</span>([EnforceRange] unsigned long long width, [EnforceRange] unsigned long long height), Exposed=(Window,Worker), <span>Transferable</span>]
 interface <dfn>OffscreenCanvas</dfn> : <span>EventTarget</span> {