Fix Uninitialized Constant RequestError

[SeeRM rapid7#8765] NameError uninitialized constant

Author: wchen-r7

modules/post/windows/gather/enum_ad_user_comments.rb

@@ -47,7 +47,7 @@ def run
         return
       end
     rescue ::Exception => e
-      if e.kind_of?(RuntimeError) or e.kind_of?(RequestError)
+      if e.kind_of?(RuntimeError) or e.kind_of?(::Rex::Post::Meterpreter::RequestError)
         # Can't bind or in a network w/ limited accounts
         print_error(e.message)
         return