[action][sh] fix undefined sh_enabled? method when using Action.sh fr…

…om a different module (#21408)

fix error: undefined method `sh_enabled?' for Fastlane::Actions::Helper:Class (NoMethodError if Helper.sh_enabled?

fastlane/lib/fastlane/helper/sh_helper.rb

@@ -42,7 +42,7 @@ def self.sh_control_output(*command, print_command: true, print_command_output:
 
       result = ''
       exit_status = nil
-      if Helper.sh_enabled?
+      if FastlaneCore::Helper.sh_enabled?
         # The argument list is passed directly to Open3.popen2e, which
         # handles the variadic argument list in the same way as Kernel#spawn.
         # (http://ruby-doc.org/core-2.4.2/Kernel.html#method-i-spawn) or