DEFAULT_PASSWORD の文字数を PASSWORD_MIN_LEN に合わせる

[nanasess]

メンバー登録時に PASSWORD_MIN_LEN より少ないエラーとなるため

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.61%. Comparing base (9a22b40) to head (db8b52a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1203   +/-   ##
=======================================
  Coverage   49.61%   49.61%           
=======================================
  Files          83       83           
  Lines       10692    10692           
=======================================
  Hits         5305     5305           
  Misses       5387     5387           

Flag	Coverage Δ
tests	49.61% <ø> (ø)

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