MdtT0SegmentFitter - Reduce the maximal iteration

Hi everybody,

the trigger runs from time to time into the debug stream because the T0 mdt fit is stuck. That's because the segment fit takes massively many iterations to converge. Usually, it's done in 20-100 iterations, but in these cases it exceeds the large number of 1M. @smh already investigated this and proposed to reduce the maximum. Thanks a lot for it.

Test of the patch on 42K data16 events does not indicate any impact on the physics: All_quick_plots.pdf

Closes ATR-26098