Tests/LibWeb: Add ref test for border-radius shrink of zero sized box

Tests/LibWeb/Ref/border-radius-shrink-zero-sized-box-ref.html

@@ -0,0 +1 @@
+<!-- This page is intentionally left blank. -->

Tests/LibWeb/Ref/border-radius-shrink-zero-sized-box.html

@@ -0,0 +1,10 @@
+<style>
+  #test {
+    background-color: red;
+    border-radius: 10px;
+    width: 0px;
+    height: 0px;
+  }
+</style>
+<div id="test">
+</div>

Tests/LibWeb/Ref/manifest.json

@@ -16,5 +16,6 @@
     "square-flex.html": "square-ref.html",
     "svg-gradient-spreadMethod.html": "svg-gradient-spreadMethod-ref.html",
     "svg-radialGradient.html": "svg-radialGradient-ref.html",
-    "svg-symbol.html": "svg-symbol-ref.html"
+    "svg-symbol.html": "svg-symbol-ref.html",
+    "border-radius-shrink-zero-sized-box.html": "border-radius-shrink-zero-sized-box-ref.html"
 }