修复删除加密的m3u8文件时，key没有被删除的问题 https://github.com/AriaLyy/Aria/issues/735#issuecomment-673958845

app/src/main/java/com/arialyy/simple/core/download/m3u8/M3U8VodDLoadActivity.java

@@ -120,7 +120,7 @@ public class M3U8VodDLoadActivity extends BaseActivity<ActivityM3u8VodBinding> {
       }
 
       @Override public void cancel(View v, AbsEntity entity) {
-        Aria.download(this).load(mTaskId).cancel();
+        Aria.download(this).load(mTaskId).cancel(true);
         mTaskId = -1;
       }
     });