Fix for checking if raw connection transaction open

[aidanharan]

Fix for checking if raw connection transaction open.

https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/actions/runs/13243848935/job/36965406558

  2) Failure:
ActiveRecord::AdapterConnectionTest#test_0006_unmaterialized transaction state can be restored after a reconnect [/usr/local/bundle/bundler/gems/rails-50efa73e0a96/activerecord/test/cases/adapter_test.rb:604]:
Expected false to be truthy.

  3) Failure:
ActiveRecord::AdapterConnectionTest#test_0003_materialized transaction state can be restored after a reconnect [/usr/local/bundle/bundler/gems/rails-50efa73e0a96/activerecord/test/cases/adapter_test.rb:570]:
Expected false to be truthy.

  4) Failure:
ActiveRecord::AdapterConnectionTest#test_0002_materialized transaction state is reset after a reconnect [/usr/local/bundle/bundler/gems/rails-50efa73e0a96/activerecord/test/cases/adapter_test.rb:560]:
Expected false to be truthy.

  5) Failure:
ActiveRecord::AdapterConnectionTest#test_0004_materialized transaction state is reset after a disconnect [/usr/local/bundle/bundler/gems/rails-50efa73e0a96/activerecord/test/cases/adapter_test.rb:580]:
Expected false to be truthy.