Issue #3250: Using RegisterOM caused infinit recursion in DESTROY()

the cause is not obvious. For now go back to using RegisterDriver.

scripts/test/Selenium/Customer/MultiAttachmentUpload/TicketMessage.t

@@ -25,7 +25,7 @@ use utf8;
 use Test2::V0;
 
 # OTOBO modules
-use Kernel::System::UnitTest::RegisterOM;    # Set up $Kernel::OM
+use Kernel::System::UnitTest::RegisterDriver;    # Set up $Kernel::OM, $main::Self is also set up, but not used
 use Kernel::System::UnitTest::Selenium;
 use Kernel::Output::HTML::Layout ();