[0.16.36] Inconsistent number size for constant combinators

[testasdf]

Minor problem: In the GUI of a constant combinator, if you input a too large number it will be truncated to 64bit. But only a 32bit number is actually saved.

I'm using Ubuntu 64 bit, steam version, loading a 0.15 save file, if that matters.

[Loewchen]

Based on the following NaB: viewtopic.php?f=48&t=58419