add force to guestcommands test too

provisioner/guest_commands_test.go

@@ -183,7 +183,7 @@ func TestMovePath(t *testing.T) {
 		t.Fatalf("Failed to create new GuestCommands for OS: %s", WindowsOSType)
 	}
 	cmd = guestCmd.MovePath("C:\\Temp\\SomeDir", "C:\\Temp\\NewDir")
-	if cmd != "powershell.exe -Command \"mv C:\\Temp\\SomeDir C:\\Temp\\NewDir\"" {
+	if cmd != "powershell.exe -Command \"mv C:\\Temp\\SomeDir C:\\Temp\\NewDir\ -force"" {
 		t.Fatalf("Unexpected Windows remove dir cmd: %s", cmd)
 	}