update read_number_waterfill(), Fix Itemprinter material detection

[jw098]

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[Mysticial]

Rather than breaking out on the first match, you might want to run all of them anyway, then do a majority vote on the results (after throwing out obvious incorrect reads like empty string or letters). TeraCardReader does this with the star count:

Arduino-Source/SerialPrograms/Source/PokemonSV/Inference/Tera/PokemonSV_TeraCardDetector.cpp

Line 132 in ba9d5bd

const std::vector<double> DISTANCES{70, 80, 90, 100, 110, 120, 130};

The reason is that on the borderline cases may return neither an empty string nor a valid result. You'll want to result when the "signal is strongest".