Fixes Sandbox samples key input interfering with the main dropdown by making the scene container focusable

[soywiz]

Fixes #1590

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (416f94e) 51.19% compared to head (e559bb9) 51.19%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1795      +/-   ##
==========================================
- Coverage   51.19%   51.19%   -0.01%     
==========================================
  Files        1744     1744              
  Lines      102416   102423       +7     
  Branches    14479    14479              
==========================================
  Hits        52431    52431              
- Misses      46048    46059      +11     
+ Partials     3937     3933       -4     

Flag	Coverage Δ
unittests	51.19% <0.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
...mmonMain/kotlin/korlibs/korge/ui/UIFocusManager.kt	35.18% <0.00%> (-5.25%)	⬇️

... and 20 files with indirect coverage changes

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