fix(HLS): Delete subtitle segments as they are merged

devine/core/manifests/hls.py

@@ -530,6 +530,7 @@ def merge_discontinuity(include_this_segment: bool, include_map_data: bool = Tru
                         discontinuity_data = discontinuity_file.read_bytes()
                         f.write(discontinuity_data)
                         f.flush()
+                        discontinuity_file.unlink()
 
         save_dir.rmdir()