Remove textfield focus when pressing enter

[mfl28]

• Removes textfield focus when pressing enter.

Closes #75 .

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (8de05b1) 85.91% compared to head (a2d80f4) 85.93%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #76      +/-   ##
============================================
+ Coverage     85.91%   85.93%   +0.01%     
  Complexity     1413     1413              
============================================
  Files            92       92              
  Lines          5767     5773       +6     
  Branches        524      524              
============================================
+ Hits           4955     4961       +6     
  Misses          551      551              
  Partials        261      261              

Impacted Files	Coverage Δ
...mfl28/boundingboxeditor/controller/Controller.java	77.93% <100.00%> (+0.08%)	⬆️
...l28/boundingboxeditor/ui/EditorsSplitPaneView.java	98.13% <100.00%> (+0.01%)	⬆️
...28/boundingboxeditor/ui/ImageFileExplorerView.java	100.00% <100.00%> (ø)
.../mfl28/boundingboxeditor/ui/TagScrollPaneView.java	98.73% <100.00%> (+0.01%)	⬆️

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication