Fix stalled Run3 reco job

Hi,

in case of BI sMDTs (added for Run3) where no MDT calibration data is available yet, currently the MDT calibration is skipped when running reconstruction. However, instead of continuing the for loop on the MdtTubeCalibContainer, we had a return statement that caused the algorithm to get stalled in AthenaMT (not in serial). Fixing that.

Best, Nico