Use target['Platform'] instead of target_platform

Author: kkirsche

modules/exploits/multi/http/oracle_weblogic_wsat_deserialization_rce.rb

@@ -56,11 +56,11 @@ def initialize(info = {})
   end
 
   def cmd_base
-    target_platform == 'win' ? 'cmd' : '/bin/sh'
+    target['Platform'] == 'win' ? 'cmd' : '/bin/sh'
   end
 
   def cmd_opt
-    target_platform == 'win' ? '/c' : '-c'
+    target['Platform'] == 'win' ? '/c' : '-c'
   end
 
   def process_builder_payload