Fix SV engine minimum weight

[neoancient]

Minimum weight for a support vehicle fission or TL C fusion engine is 5 tons, not 0.5.

Fixes MegaMek/megameklab#910

[codecov]

Codecov Report

Merging #3898 (448ffe2) into master (8870cb9) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #3898      +/-   ##
============================================
- Coverage     23.59%   23.55%   -0.04%     
  Complexity     4810     4810              
============================================
  Files          2211     2212       +1     
  Lines        243194   243096      -98     
  Branches      45496    45496              
============================================
- Hits          57374    57265     -109     
- Misses       184361   184372      +11     
  Partials       1459     1459              

Impacted Files	Coverage Δ
megamek/src/megamek/common/Engine.java	36.14% <0.00%> (ø)
megamek/src/megamek/common/Board.java	4.74% <0.00%> (-0.02%)	⬇️
...c/megamek/client/ui/swing/boardview/BoardView.java	0.62% <0.00%> (-0.01%)	⬇️
...k/src/megamek/client/ui/swing/minimap/Minimap.java	0.00% <0.00%> (ø)
...ient/ui/baseComponents/DefaultScrollablePanel.java	0.00% <0.00%> (ø)
megamek/src/megamek/common/AmmoType.java	98.83% <0.00%> (+<0.01%)	⬆️

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