fix bug: last segment of ts not trigger 'on_hls'

[duiniuluantanqin]

fix bug: last segment of ts not trigger 'on_hls', because of 'on_unpublish' earlier than 'segment_close',
see #2068

Phenomenon: After the streaming ends, the last HLS segment does not trigger on_hls.
Cause: In the function SrsHlsController::on_unpublish(), on_unpublish occurs earlier than segment_close, causing the notification of the last segment to be forgotten in the tasks.
Solution: Place on_unpublish after segment_close.

srs_error_t SrsHlsController::on_unpublish()
{
    srs_error_t err = srs_success;

    if ((err = muxer->on_unpublish()) != srs_success) {    
        return srs_error_wrap(err, "muxer unpublish");                
    }           
                                                                                   
    if ((err = muxer->flush_audio(tsmc)) != srs_success) {           
        return srs_error_wrap(err, "hls: flush audio");                     
    }       
                                                                                       
    if ((err = muxer->segment_close()) != srs_success) {              
        return srs_error_wrap(err, "hls: segment close");                
    }     
                                                       
    return err;
}

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[codecov-commenter]

Codecov Report

Merging #2438 (9648d65) into develop (a594678) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #2438      +/-   ##
===========================================
- Coverage    42.77%   42.77%   -0.01%     
===========================================
  Files          101      101              
  Lines        35944    35944              
===========================================
- Hits         15376    15375       -1     
- Misses       20568    20569       +1     

| Impacted Files | Coverage Δ | |'

Translated to English while maintaining the markdown structure:

'| Impacted Files | Coverage Δ | |
|---|---|---|
| trunk/src/app/srs_app_hls.cpp | 0.00% <0.00%> (ø) | |'

Translated to English while maintaining the markdown structure:

'| trunk/src/app/srs_app_hls.cpp | 0.00% <0.00%> (ø) | |
| trunk/src/protocol/srs_service_utility.cpp | 72.43% <0.00%> (-0.55%) | ⬇️ |

---

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| Δ = absolute <relative> (impact), ø = not affected, ? = missing data |

Translated to English while maintaining the markdown structure:

| Δ = absolute <relative> (impact), ø = not affected, ? = missing data |

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