269758@main broke builds that enable WebXR

https://bugs.webkit.org/show_bug.cgi?id=263684
rdar://117494044

Unreviewed build fix.

* Source/WebCore/platform/graphics/cocoa/GraphicsContextGLCocoa.mm:
(WebCore::GraphicsContextGLCocoa::enableRequiredWebXRExtensionsImpl):
Fix mispelling of Extension.

Canonical link: https://commits.webkit.org/269783@main

Source/WebCore/platform/graphics/cocoa/GraphicsContextGLCocoa.mm

@@ -730,7 +730,7 @@ static bool needsEAGLOnMac()
         && enableExtension("GL_ANGLE_framebuffer_blit"_s)
         && enableExtension("GL_EXT_sRGB"_s)
         && enableExtension("GL_OES_EGL_image"_s)
-        && enableExtenison("GL_OES_rgb8_rgba8"_s);
+        && enableExtension("GL_OES_rgb8_rgba8"_s);
 }
 #endif