454 fq childRes HIDE CHILD group cap wins

autotest-case: 454 scope: group freeQuantity; childRes=True group: fq.454 childRes visible group with hidden children group free 2 child free A B C group restrictions: min=3 max=3 free=2 children: prices=[30, 20, 10] defaults=[1, 1, 1] childMin=[1, 1, 1] childFree=[1, 1, 1] manual hide group: - manual hide child modifiers: ['mod.fq.454 childRes visible group with hidden children group free 2 child free A B C.a.p30 HIDE CHILD IN IIKOWEB', 'mod.fq.454 childRes visible group with hidden children group free 2 child free A B C.b.p20 HIDE CHILD IN IIKOWEB'] expected: quick add chooses the most expensive eligible defaults as free; group free is the cap, and child free can additionally limit a child when childRes=true.