Update leave preview icon (#187)

preview/src/widget.html

@@ -91,7 +91,9 @@
 
                 <div role="button" id="leave-button" class="leave-button" tabindex="0">
                     <svg class="icon" aria-hidden="true" width="20" height="20" viewBox="0 0 20 20" fill="none" xmlns="http://www.w3.org/2000/svg">
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+                        <path fill-rule="evenodd" clip-rule="evenodd" d="M3.25367 1.5C2.91625 1.5 2.59266 1.63404 2.35407 1.87263C2.11548 2.11121 1.98145 2.43481 1.98145 2.77222V16.9278C1.98145 17.2652 2.11548 17.5888 2.35407 17.8274C2.59266 18.066 2.91625 18.2 3.25367 18.2H7.29811C7.71233 18.2 8.04811 18.5358 8.04811 18.95C8.04811 19.3642 7.71233 19.7 7.29811 19.7H3.25367C2.51843 19.7 1.8133 19.4079 1.29341 18.888C0.773518 18.3681 0.481445 17.663 0.481445 16.9278V2.77222C0.481445 2.03698 0.773518 1.33186 1.29341 0.811965C1.8133 0.292072 2.51843 0 3.25367 0H7.29811C7.71233 0 8.04811 0.335786 8.04811 0.75C8.04811 1.16421 7.71233 1.5 7.29811 1.5H3.25367Z" fill="currentColor"/>
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                 </div>