Fix tab completion for set StageEncoder

lib/msf/ui/console/command_dispatcher/core.rb

@@ -2936,7 +2936,7 @@ class Core
       return option_values_payloads() if opt.upcase == 'PAYLOAD'
       return option_values_targets()  if opt.upcase == 'TARGET'
       return option_values_nops()     if opt.upcase == 'NOPS'
-      return option_values_encoders() if opt.upcase == 'StageEncoder'
+      return option_values_encoders() if opt.upcase == 'STAGEENCODER'
     end
 
     # Well-known option names specific to modules with actions