Fix use-after-move in WebCore::WebGLRenderingContextBase constructor

https://bugs.webkit.org/show_bug.cgi?id=267818
<rdar://121317766>

Reviewed by Chris Dumez.

* Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp:
(WebCore::WebGLRenderingContextBase::WebGLRenderingContextBase):
- Use m_attributes to initialize m_creationAttributes since `attributes`
  was moved from to initialize m_attributes.

Canonical link: https://commits.webkit.org/273267@main

Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp

@@ -471,7 +471,7 @@ WebGLRenderingContextBase::WebGLRenderingContextBase(CanvasBase& canvas, WebGLCo
     : GPUBasedCanvasRenderingContext(canvas)
     , m_generatedImageCache(4)
     , m_attributes(WTFMove(attributes))
-    , m_creationAttributes(attributes)
+    , m_creationAttributes(m_attributes)
     , m_numGLErrorsToConsoleAllowed(canvas.scriptExecutionContext()->settingsValues().webGLErrorsToConsoleEnabled ? maxGLErrorsAllowedToConsole : 0)
 {
 }