Disable rounded corners for lyric window

Ensure that the lyric window looks the same
on Windows 11 as it does on other systems.

Ref: https://github.com/electron/electron/issues/46468

src/main/modules/winLyric/main.ts

@@ -127,6 +127,7 @@ export const createWindow = () => {
     minimizable: false,
     maximizable: false,
     fullscreenable: false,
+    roundedCorners: false,
     show: false,
     alwaysOnTop: isAlwaysOnTop,
     skipTaskbar: !isShowTaskbar,