[StellarKnights] 数式解釈時の round_type 指定が不適切だったのを修正

[ViVi-shark]

No description provided.

[codecov]

Codecov Report

Merging #481 (5bee07c) into master (8f24f72) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 5bee07c differs from pull request most recent head 6164702. Consider uploading reports for the commit 6164702 to get more accurate results

@@           Coverage Diff           @@
##           master     #481   +/-   ##
=======================================
  Coverage   95.35%   95.35%           
=======================================
  Files         292      292           
  Lines       18744    18744           
=======================================
  Hits        17874    17874           
  Misses        870      870           

Impacted Files	Coverage Δ
lib/bcdice/game_system/StellarKnights.rb	98.86% <100.00%> (ø)

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[ysakasin]

LGTM!!!