fix(p/demo/avl): correct order for IterateByOffset

[thehowl]

the tests were there, but apparently slicesEqual had a bug. lol.

This comes from #3324, and makes it so that IterateByOffset and ReverseIterateByOffset use the correct order. I changed the descending argument of the underlying TraverseByOffset to match it with avl.Node.TraverseInRange.

[Gno2D2]

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[moul]

b28a4e3 fixes another (early-termination) bug that was also detected with #3324.