fix: Use sum() instead of count() in HandCalculator.estimate_hand_value()

[Apricot-S]

Collection has no count()

[Nihisil]

@Apricot-S actually I have uncommitted changes with hand optimizations and in my version it looks like that:

aka_dora_tiles = {FIVE_RED_MAN, FIVE_RED_PIN, FIVE_RED_SOU}
precomputed_aka_dora = sum(1 for t in tiles if t in aka_dora_tiles)

is it ok if we keep that version? I plan to make PR on next few hours, so this PR can be closed

[Apricot-S]

@Nihisil
Since x in xs returns bool and bool can be summed with sum, I think x in xs for ... is better than 1 for ... if x in xs. What do you think?

[Apricot-S]

1 for ... if may be more efficient because it doesn't have any extra elements.
Profiling would be needed to determine which is better.