fix rod rolling output amount

[AlertingAvian]

What is the new behavior?

Fixes issue #636, sets output amount of rod rolling recipes to 2

Implementation Details

Changed output of rolling mill rod recipes to be consistent with 0.7.14

Outcome

Fixes: #636

[SverhRazum-Nah]

You fixed the number. But did you fix the recipe yourself (so that the rods are created from ingots, and not from rods)?

[AlertingAvian]

The recipe fix had already been completed by Exzept1on with 3a62265, I only changed the output amount. The fix for rod input is not in the pre-release though so I didn't see it originally when writing my comment on 636