Only set Newt window icons on Windows (#1398) #173

Job	Run time
Test Processing	3m 18s
(linux/aarch64) Create Processing Build	8m 21s
(linux/x64) Create Processing Build	9m 3s
(windows/x64) Create Processing Build	12m 34s
(macos/aarch64) Create Processing Build	3m 36s
(macos/x64) Create Processing Build	16m 34s
	53m 26s

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