Fix border move indication for vehicles

[mangofeet]

Draws the indicator border last instead to ensure that the "form" stroke does not draw over it for ones that reuse the thicker width

[codecov]

Codecov Report

Base: 23.00% // Head: 23.00% // No change to project coverage 👍

Coverage data is based on head (9de5d0e) compared to base (4753cde).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #4017   +/-   ##
=========================================
  Coverage     23.00%   23.00%           
  Complexity     4813     4813           
=========================================
  Files          2263     2263           
  Lines        249034   249034           
  Branches      46244    46244           
=========================================
  Hits          57280    57280           
  Misses       190295   190295           
  Partials       1459     1459           

Impacted Files	Coverage Δ
...k/src/megamek/client/ui/swing/minimap/Minimap.java	0.00% <0.00%> (ø)

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