remove keyscan_extract and modify calling modules

modules/post/windows/capture/keylog_recorder.rb

@@ -243,7 +243,7 @@ class MetasploitModule < Msf::Post
   #
   # @return [void] A useful return value is not expected here
   def write_keylog_data
-    output = session.ui.keyscan_extract(session.ui.keyscan_dump)
+    output = session.ui.keyscan_dump
 
     if not output.empty?
       print_good("Keystrokes captured #{output}") if datastore['ShowKeystrokes']

plugins/beholder.rb

@@ -127,7 +127,7 @@ class Plugin::Beholder < Msf::Plugin
         return
       end
 
-      collected_keys = sess.ui.keyscan_extract(sess.ui.keyscan_dump)
+      collected_keys = sess.ui.keyscan_dump
       store_keystrokes(sid, collected_keys)
     end