Changed variable names within financial report for clarity.

[heckindoc]

Title says it all. Working on something different where I needed to look something up in FinancialReport and wanted to improve readability of the code.

[codecov]

Codecov Report

❌ Patch coverage is 38.09524% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 15.20%. Comparing base (295b496) to head (27a9a0d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...Q/src/mekhq/campaign/finances/FinancialReport.java	38.09%	13 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #9106      +/-   ##
============================================
- Coverage     15.21%   15.20%   -0.02%     
+ Complexity     9344     9335       -9     
============================================
  Files          1308     1308              
  Lines        173416   173416              
  Branches      26220    26220              
============================================
- Hits          26388    26366      -22     
- Misses       143961   143974      +13     
- Partials       3067     3076       +9     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.