Fix FormatNumber Decimals with Negative Numbers

[PabstMirror]

Before:
[-12.75,0,3] call CBA_fnc_formatNumber; = "-12.-8-50"
[-0.12345,1,5] call CBA_fnc_formatNumber; = "-0.-2-3-4-5-5"

[commy2]

👍

It's a bit strange how it rounds upwards negative numbers ending with 5, but that seems to be consistent with what the game does anyway.

[-1.25,0,1] call cba_fnc_formatNumber
-> "-1.2"

round -12.5
-> -12