What he did should not have affected the alignment, but if it is off just a little, perhaps. Make sure that the air pressure is the same in both tires.
If it bothers you and you believe that the alignment is good, as it was aligned recently, and you are reasonably mechanically inclined, you can correct steering wheel position. Drive the car up on ramps and adjust one tie rod to lengthen it and the other to shorten it such that the change corrects the steering wheel position. If it is off only a little, a quarter-turn on each side should do it.
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