Fix ending balance computation

[andhit-r]

No description provided.

[coveralls]

Coverage remained the same at 82.168% when pulling 974b7a4 on 8.0-fix1 into b0bbf11 on 8.0.

[codecov-io]

Codecov Report

Merging #17 into 8.0 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              8.0      #17   +/-   ##
=======================================
  Coverage   82.16%   82.16%           
=======================================
  Files          17       17           
  Lines         286      286           
=======================================
  Hits          235      235           
  Misses         51       51

Impacted Files	Coverage Δ
...jbc_lap_mutasi_helper/reports/lap_mutasi_helper.py	61.53% <ø> (ø)	⬆️

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