[0.13.6] Stack inserter capacity bonus from 0.13.5

[saturn7]

With 0.13.6, the stack inserter capacity bonus was removed from logisitcs 2 to the new stack inserter tech. However when loading a save from 0.13.5 in 0.13.6, this bonus is incorrectly retained.

To reproduce:
1. create new game in 0.13.6, research all techs (/c game.player.force.research_all_technologies()). The stack inserter capacity bonus is 11

2. create new game in 0.13.5, research all techs. The stack inserter capacity bonus is 11. Save the game
3. Load the game in 0.13.6, research all techs (i.e. the new stack inserter tech). The stack inserter capacity bonus is now 12.

Edit:
Desired outcome: The final stack inserter capacity bonus should be the same, independently whether the game was started in 0.13.5 or 0.13.6.

[AntiElitz]

This is caused due to a related bug viewtopic.php?f=7&t=28420

[kovarex]

I know, I wanted to make a migration, but then I realized that the migration would have to be specific only pre 0.13 versions. So I decided to let it be, in t his special case robots will have one extra stack size, not a big deal.