SaiFicSkillTableのcommand_patternがRuby依存にならないように

[ysakasin]

BCDice::Base#register_prefix にRegexpのインスタンスが渡されると、 BCDice::Base#command_pattern がJavaScript等で解釈できない応答になるため修正する。

register_prefix にRegexpが渡されると以下のようになってしまう。 (?-mix:RTT[1-6]?) の部分がJavaScriptでは解釈できない。

/^S?([+\-\dD(]+|\d+B\d+|C|choice|D66|(repeat|rep|x)\d+|\d+R\d+|\d+U\d+|BCDiceVersion|(?-mix:RTT[1-6]?)|RCT)/i

[codecov]

Codecov Report

Merging #401 (1aa4901) into master (2ec6679) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 1aa4901 differs from pull request most recent head 1eb03a9. Consider uploading reports for the commit 1eb03a9 to get more accurate results

@@           Coverage Diff           @@
##           master     #401   +/-   ##
=======================================
  Coverage   95.06%   95.06%           
=======================================
  Files         283      283           
  Lines       18484    18484           
=======================================
  Hits        17571    17571           
  Misses        913      913           

Impacted Files	Coverage Δ
lib/bcdice/common_command/add_dice.rb	100.00% <100.00%> (ø)
lib/bcdice/dice_table/sai_fic_skill_table.rb	100.00% <100.00%> (ø)

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