Fix Ideya Capture sometimes stealing extra spheres

I recently watched a commentated 200-Emblem TAS, where they commented on the Ideya Capture sometimes stealing an extra sphere.
Depending on how many spheres are needed, it'll take X amount of spheres every time that it takes spheres.
If the amount needed is not a multiple of X, it'll steal additional spheres at the end (for example, with 80, it'll go 75, then 78, then 81, having taken 1 extra sphere from the player).

This merge request fixes that.

This also cleans up a redundant startingspheres variable, which could be avoided by just swapping two lines.

­

­

TL;DR: Fixed the Ideya Capture sometimes stealing extra spheres in NiGHTS stages