Bank wrap-around on voice change not working problem for first and last banks

[diyelectromusic]

I think it is a problem with m_nNumHighestBank in the SysFileLoader as a consequence of moving to 1-indexed numbered banks. More details to follow...

Update: Yes, this is the issue. The bank selection in uimenu.cpp is also not working properly for cases where there are skipped bank numbers.

Kevin

[probonopd]

Thanks for finding and for fixing this issue Kevin.