Fix: `Math:gen_rng`の`seed`に`num`を与え、`options.algorithm`に`chacha20`を指定した或いは何も指定しなかった場合、`seed & 255`を内部的に`seed`としてしまう問題を修正。#1019

MineCake147E wants to merge 5 commits intoaiscript-dev:masteraiscript-dev/aiscript:masterfrom

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