Revert "[action] [PR:13384] Adjust packet size for testQosSaiLossyQueueVoqMultiSrc"

[lolyu]

Reverts #14760

This causes nightly regression to dualtor testbed.

qos/test_qos_sai.py::TestQosSai::testQosSaiDscpQueueMapping[single_asic] 
-------------------------------- live log setup --------------------------------
21:52:21 __init__._fixture_generator_decorator    L0088 ERROR  | 
KeyError(8)
Traceback (most recent call last):
  File "/azp/_work/30/s/tests/common/plugins/log_section_start/__init__.py", line 84, in _fixture_generator_decorator
    res = next(it)
  File "/azp/_work/30/s/tests/qos/qos_sai_base.py", line 2337, in tc_to_dscp_count
    tc_to_dscp_count_map[int(tc)] += 1
KeyError: 8
ERROR   

[lolyu]

cc @zhixzhu

[StormLiangMS]

/azp run Azure.sonic-mgmt

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