Fix MML 1532: Total Warfare Flamer should be unofficial

[Sleet01]

"Total Warfare Flamer" is listed as a Standard CI support weapon, but has been replaced by the Pistol (Flamer) weapon.
The code comments state that this weapon should be marked unofficial but currently it is not.

Testing:

• Tested weapons with various tech levels to confirm "Unofficial" setting is working correctly
• Ran all three projects' unit tests

Close MegaMek/megameklab#1532

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.31%. Comparing base (a7d3d65) to head (e9b317f).
Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5622   +/-   ##
=========================================
  Coverage     29.31%   29.31%           
- Complexity    13787    13803   +16     
=========================================
  Files          2461     2461           
  Lines        262579   262664   +85     
  Branches      46976    47007   +31     
=========================================
+ Hits          76966    77010   +44     
- Misses       181746   181797   +51     
+ Partials       3867     3857   -10     

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