I don't know of any experimental results addressing your question.

My own interpretation of the "doing your good deed for the day" phenomenon is that people have a fixed capacity for sacrifice - that after having made a number of decisions where they felt like they were sacrificing something, people stop being being willing to sacrifice more.

So my guess would be that the effect applies to people who don't enjoy giving to beggars (whether or not they're consciously aware of the effect) but not to people who do enjoy giving to beggars.