[Fix] fix SECOND Waymo results

[happynear]

The results of SECOND on Waymo do not match the log file. The results on README are too low.

README:
| [SECFPN]|5|3 Class|2x|8.12||58.0|53.5|51.5|48.3|log|
| above @ Car|||2x|8.12||58.5|57.9|51.6|51.1| |
| above @ Pedestrian|||2x|8.12||63.9|54.9|56.0|48.0| |
| above @ Cyclist|||2x|8.12||48.6|47.6|46.8|45.8| |

LOG:
{"mode": "val", "epoch": 24, "iter": 1977, "lr": 1e-05, "Vehicle/L1 mAP": 0.67149, "Vehicle/L1 mAPH": 0.66598, "Vehicle/L2 mAP": 0.58660, "Vehicle/L2 mAPH": 0.58173, "Pedestrian/L1 mAP": 0.68099, "Pedestrian/L1 mAPH": 0.59131, "Pedestrian/L2 mAP": 0.59516, "Pedestrian/L2 mAPH": 0.51546, "Sign/L1 mAP": 0.0, "Sign/L1 mAPH": 0.0, "Sign/L2 mAP": 0.0, "Sign/L2 mAPH": 0.0, "Cyclist/L1 mAP": 0.60655, "Cyclist/L1 mAPH": 0.59519, "Cyclist/L2 mAP": 0.58416, "Cyclist/L2 mAPH": 0.57321, "Overall/L1 mAP": 0.65301, "Overall/L1 mAPH": 0.61749, "Overall/L2 mAP": 0.58864, "Overall/L2 mAPH": 0.55680}

[CLAassistant]

All committers have signed the CLA.

[Tai-Wang]

Thanks for your kind correction. I just found the PR for enhancing SECOND results on Waymo in the changelog has also incorrect PR number/link (Improvements in v0.8.0, Enhance SECOND benchmark on Waymo with stronger baselines. (#166) -> Enhance SECOND benchmark on Waymo with stronger baselines. (#205) ). Could you please also modify it in this PR?

[happynear]

Seems that this PR(#205) didn't modify the results in README, but changed the log.

[Tai-Wang]

Seems that this PR(#205) didn't modify the results in README, but changed the log.

Yes it's my carelessness at that time (both the PR number in the changelog & the PR for updating benchmark not changing the README). I just want you to help modify the changelog by the way.

[happynear]

OK, I changed the PR number.

[codecov]

Codecov Report

Merging #363 (0528c1f) into master (440e44a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #363   +/-   ##
=======================================
  Coverage   49.69%   49.69%           
=======================================
  Files         174      174           
  Lines       11758    11758           
  Branches     1838     1838           
=======================================
  Hits         5843     5843           
  Misses       5555     5555           
  Partials      360      360           

Flag	Coverage Δ
unittests	49.69% <ø> (ø)

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[OpenMMLab-Assistant-007]

Hi!
@happynear
First of all, we want to express our gratitude for your significant PR in the OpenMMLab project. Your contribution is highly appreciated, and we are grateful for your efforts in helping improve this open-source project during your personal time. We believe that many developers will benefit from your PR.

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