Remove the movement penalty of trench against infantry

[DreJaDe]

1. With 1-2km range per tile, i dont think ot slows them that much.

2. This is world war 2. Trenches arent that big or wide like in ww1. They should be easily crossable.

3. Not really used to slow people down like in aos so yeah.

4. Makes them more usable.

[TntAttack]

I think the problem is scaling. The trenches takes one tile, so you'd expect its size and effect to be as well.

Since you can't entrench buildings and units (as in on top of a unit), it doesn't help that when you can, you'd expect it to do something.