look for the VA Autotext entry "Refactor Encapsulate Field". you can edit this to change how Encapsulate Field works, so you should be able to change it to only insert a getter.
if i understand correctly then you could try leaving the autotext entry alone and pressing CTRL-SHIFT-L while on the unwanted function. this will delete the entire line, leaving you with the single function you wanted.
I just ran into this today when I tried to make use of the refactoring method for the first time. What I'd suggest is that in the dialog "Make VA Snippet substituations" would let you choose whether to create a getter, a setter or both. Atm it's quite a lot of manual tweaking to get the refactoring feature to only add a getter, for me resulting in manually adding the function being a lot faster than using VAX' refactoring tool.