Fixes UIWindow scale handlers + improve close button icon

[soywiz]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 39.28% and project coverage change: -0.02 ⚠️

Comparison is base (47ad4b9) 51.17% compared to head (86d58f0) 51.16%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1776      +/-   ##
==========================================
- Coverage   51.17%   51.16%   -0.02%     
==========================================
  Files        1740     1741       +1     
  Lines      102181   102205      +24     
  Branches    14458    14459       +1     
==========================================
- Hits        52293    52290       -3     
- Misses      45932    45940       +8     
- Partials     3956     3975      +19     

Flag	Coverage Δ
unittests	51.16% <39.28%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
.../src/commonMain/kotlin/korlibs/korge/ui/UIIcons.kt	0.00% <0.00%> (ø)
...src/commonMain/kotlin/korlibs/korge/ui/UIWindow.kt	0.00% <0.00%> (ø)
...e/src/commonMain/kotlin/korlibs/korge/view/View.kt	52.71% <0.00%> (-0.07%)	⬇️
.../commonMain/kotlin/korlibs/korge/view/BlendMode.kt	84.12% <100.00%> (+1.07%)	⬆️
...monTest/kotlin/korlibs/korge/view/BlendModeTest.kt	100.00% <100.00%> (ø)

... and 21 files with indirect coverage changes

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