Function getCurrentControlProfile defined in header but not implemented

[y-decimal]

control_profile.h defines a getCurrentControlProfile function, but it was never implemented in control_profile.c

The function should probably either be implemented or alternatively its declaration removed from the header

I previously made a PR implementing the function (#11528) because I briefly thought I'd need it in another PR but ultimately ended up not needing it and decided it would make more sense to discuss how to handle this in an issue first