Issue #1041580 by Monochrome, daycrom: Fixed Favicon.ico 404s on IIS.

web.config

@@ -29,6 +29,9 @@
         <rule name="Force simple error message for requests for non-existent favicon.ico" stopProcessing="true">
           <match url="favicon\.ico" />
           <action type="CustomResponse" statusCode="404" subStatusCode="1" statusReason="File Not Found" statusDescription="The requested file favicon.ico was not found" />
+          <conditions>
+            <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
+          </conditions>
         </rule>
 
     <!-- To redirect all users to access the site WITH the 'www.' prefix,