PHPStan がエラーを出すようになったのを修正

[nanasess]

• PHPStan が FPDI を見つけてくれないので明示的にロードしておく
• see https://github.com/nanasess/ec-cube2/runs/2682365533?check_suite_focus=true#step:8:20

[codecov-commenter]

Codecov Report

Merging #464 (91768ca) into master (86812bb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #464   +/-   ##
=======================================
  Coverage   53.89%   53.89%           
=======================================
  Files          76       76           
  Lines        8992     8992           
=======================================
  Hits         4846     4846           
  Misses       4146     4146           

Flag	Coverage Δ
tests	53.89% <ø> (ø)

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[okazy]

ありがとうございます。マージしました。