(maint) remove unused attributes from transaction

The :component attr_accessor became obsolete in
4741eeff6bae987c9dfa9e06e2908ae91daa4d16, and the :configurator
attr_accessor became obsolete in
f17f19dae941b17a56c1fc83ed3a89712b98c427

This is a pretty trivial commit to remove some ancient code rot.