🐞 fix: loading 修复

src/teacher/music/upload/index.tsx

@@ -417,7 +417,7 @@ export default defineComponent({
                           icon={UploadIcon}
                           class={styles.upbtn}
                           onClick={this.naiveBGMp3File}
-                          loading={this.mp3Loading}
+                          loading={this.bgmp3Loading}
                         >
                           {this.bgmp3Url
                             ? this.fileName(this.bgmp3Url)