弹窗优化

src/views/music-library/music-sheet/component/music-list.tsx

@@ -925,6 +925,7 @@ export default defineComponent({
           showIcon={false}
           title={'曲目预览'}
           class={styles.musicPreviewModal}
+          mask-closable={false}
         >
           <MusicPreView
             item={state.musicScore}