[BE] BillActionDetail 초기화시 totalPrice와 정합성 안맞는 버그 수정 #189

All 114 tests pass in 3s

22 files ±0 22 suites ±0 3s ⏱️ ±0s
114 tests ±0 114 ✅ ±0 0 💤 ±0 0 ❌ ±0
115 runs ±0 115 ✅ ±0 0 💤 ±0 0 ❌ ±0

Results for commit 3b2b01c. ± Comparison against earlier commit 27b40f1.