Fix directoryBrowse attribute from 'enable' to 'enabled'

Author: jzabroski

csharp/ql/src/Security Features/CWE-548/Web.config.good

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8" ?>
 <configuration>
   <system.webServer>
-    <directoryBrowse enable="false"/>
+    <directoryBrowse enabled="false"/>
    ...
   </system.web>
-</configuration>
+</configuration>