CommandEvent shouldn't be composed

https://bugs.webkit.org/show_bug.cgi?id=292368

Reviewed by NOBODY (OOPS!).

The CommandEvent should no longer be composed, this patch fixes that.

See whatwg/html#11255

* Source/WebCore/html/HTMLButtonElement.cpp:
(WebCore::HTMLButtonElement::handleCommand):

Author: lukewarlow

Source/WebCore/html/HTMLButtonElement.cpp

@@ -215,7 +215,6 @@ void HTMLButtonElement::handleCommand()
     CommandEvent::Init init;
     init.bubbles = false;
     init.cancelable = true;
-    init.composed = true;
     init.source = this;
     init.command = commandRaw.isNull() ? emptyAtom() : commandRaw;