AK: Escape '"' in escape_html_entities

AK/String.cpp

@@ -371,6 +371,8 @@ String escape_html_entities(const StringView& html)
             builder.append(">");
         else if (html[i] == '&')
             builder.append("&");
+        else if (html[i] == '"')
+            builder.append(""");
         else
             builder.append(html[i]);
     }