fix(Mask): compile theme variables error (#2599)

Co-authored-by: 皆虚 <jiarui.xjr@alibaba-inc.com>

Author: jerryyxu

docs/core/theme/mask.jsx

@@ -22,7 +22,7 @@ class MaskDemo extends React.Component {
 
         return (
             <div id="mask-demo-container" style={{ width: '100%', height: '400px', position: 'relative' }}>
-                <Dialog visible overlayProps={overlayProps} isFullScreen title="Welcome to Alibaba.com" footer={false}>
+                <Dialog animation={false} visible overlayProps={overlayProps} isFullScreen title="Welcome to Alibaba.com" footer={false}>
                     Start your business here by searching a popular product
                 </Dialog>
             </div>