MNT: Place filename save parameter to the end.

[phmbressan]

Pull request type

• Code changes (bugfix, features)
• Code maintenance (refactoring, formatting, tests)
• ReadMe, Docs and GitHub updates
• Other (please describe):

Checklist

• Lint (black rocketpy/ tests/) has passed locally
• All tests (pytest tests -m slow --runslow) have passed locally
• CHANGELOG.md has been updated (if relevant)

New behavior

As described by the conversation in #731 , this PR moves the filename parameter to the end so as to avoid potential future breaking changes.

Breaking change

• Yes
• No

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.97%. Comparing base (e1a2061) to head (e723768).
Report is 15 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #739      +/-   ##
===========================================
- Coverage    75.99%   75.97%   -0.02%     
===========================================
  Files           95       95              
  Lines        11015    11027      +12     
===========================================
+ Hits          8371     8378       +7     
- Misses        2644     2649       +5     

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[Gui-FernandesBR]

LGTM.