Increased backpack size to be able to carry a medikit/toolkit and 2 magazines (or equivalent mass).

It nows moves items from previous backpack to manpack that can fit.
Solves https://github.com/michail-nikolaev/task-force-arma-3-radio/issues/346
Merge pull request #380 from CorruptedHeart/LargerBackpack

Increased backpack size to be able to carry a medikit/toolkit and 2 maga...