Bug in pseudoroyal + custom piece variants training

[Belzedar94]

As discussed in the discord channel, there is a bug somewhere as the pseudo-royal commoner is not the last piece in the ordering whenever there is a custom piece on top.

Example of variant with the bug:

[allexplodeatomic:nocheckatomic] pawn = - customPiece1 = p:fmWfceFifmnD pawnTypes = p

Example of faulty behaviour (Custom piece [pawn] negative values):

NNUE derived piece values: +-------+-------+-------+-------+-------+-------+-------+-------+	r	n	b	q	k	b	n	r		-4.27	-1.43	-2.09	-4.62		-1.87	-1.69	-4.34	+-------+-------+-------+-------+-------+-------+-------+-------+	p	p	p	p	p	p	p	p		+2.16	+2.47	+2.49	+2.70	+2.28	+2.02	+2.87	+2.16	+-------+-------+-------+-------+-------+-------+-------+-------+

+-------+-------+-------+-------+-------+-------+-------+-------+

+-------+-------+-------+-------+-------+-------+-------+-------+

+-------+-------+-------+-------+-------+-------+-------+-------+

+-------+-------+-------+-------+-------+-------+-------+-------+ | P | P | P | P | P | P | P | P | | -2.01 | -2.69 | -2.53 | -2.80 | -2.20 | -1.65 | -2.93 | -2.22 | +-------+-------+-------+-------+-------+-------+-------+-------+ | R | N | B | Q | K | B | N | R | | +3.99 | +1.97 | +2.61 | +4.24 | | +2.44 | +1.97 | +4.40 | +-------+-------+-------+-------+-------+-------+-------+-------+

[ianfab]

Fixed in https://github.com/fairy-stockfish/Fairy-Stockfish/commit/00ea5136ea3ea1d811dfe8dd2427ebad43fe597f