Method name update, borderEmpty -> border

[DanVanAtta]

Overview

The 'border' method now becomes an overload, bit more obvious that it is
a simplified version of 'border(BorderBuilder)'

Functional Changes

none

[codecov-io]

Codecov Report

Merging #4683 into master will decrease coverage by <.01%.
The diff coverage is 6.25%.

@@             Coverage Diff              @@
##             master    #4683      +/-   ##
============================================
- Coverage     23.21%   23.21%   -0.01%     
+ Complexity     6212     6210       -2     
============================================
  Files           873      873              
  Lines         70489    70488       -1     
  Branches      11240    11240              
============================================
- Hits          16367    16364       -3     
  Misses        52085    52085              
- Partials       2037     2039       +2

Impacted Files	Coverage Δ	Complexity Δ
...ine/framework/map/download/DownloadMapsWindow.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...c/main/java/games/strategy/debug/ErrorMessage.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...ategy/debug/error/reporting/ErrorReportWindow.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../error/reporting/ConfirmationDialogController.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../strategy/debug/error/reporting/PreviewWindow.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...trategy/engine/lobby/client/ui/TimespanDialog.java	27.58% <0%> (ø)	3 <0> (ø)	⬇️
...ne/framework/startup/ui/panels/main/MainPanel.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...ames/strategy/triplea/settings/SettingsWindow.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...games/strategy/triplea/ui/FindTerritoryDialog.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...src/main/java/org/triplea/swing/JPanelBuilder.java	45.03% <100%> (+0.34%)	19 <1> (ø)	⬇️
... and 2 more

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[DanVanAtta]

Subsumed and merged into #4687