fix(desktop): round the Windows app icon corners further

The Windows badge used a 44px radius on its 1024px plate, which reads as
nearly square on the desktop next to other Windows 11 icons. Raise the
radius to 192px (3/16 of the plate, matching Tencent Meeting's corner)
and re-export the transparent 1024×1024 PNG from the SVG; the ICO for
the app, installer and uninstaller and the About panel image all derive
from that PNG.

apps/desktop/resources/icon-windows.svg

@@ -1,8 +1,8 @@
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-<rect rx="44" width="1024" height="1024" transform="translate(40 32)" fill="url(#paint1_linear_1637_371)" fill-opacity="0.8"/>
+<rect rx="192" width="1024" height="1024" transform="translate(40 32)" fill="#FBFBFB"/>
+<rect rx="192" width="1024" height="1024" transform="translate(40 32)" fill="url(#paint0_linear_1637_371)" fill-opacity="0.4"/>
+<rect rx="192" width="1024" height="1024" transform="translate(40 32)" fill="url(#paint1_linear_1637_371)" fill-opacity="0.8"/>
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