SE Fish Collision Fixed

Tiny compatibility fix for Space Exploration.

The problem

Space Exploration’s postprocess mod rewrites the collision mask of normal fish and drops the colliding_with_tiles_only flag.
As a result fish collide with boats (and other entities).

The fix

This mod runs after space-exploration-postprocess and simply restores the missing flag:

```lua
for _, prototype in pairs(data.raw.fish) do
if prototype.collision_mask then
prototype.collision_mask.colliding_with_tiles_only = true
end
end