Hotfix 2.3.21

UPDATE: Hide train alerts when precision key is pressed
UPDATE: Map in Curated Map Pack DLC small improvements

FIX: Grabbed object leftover clashed with newly rebuilt one at the same place - i.e. signal not active after save&load
FIX: Red flag (possible delay warning) in Active Contracts was wrongly calculated - total time over passed stations & accumulated delay overflowing to next segment was not taken into account