[Merged by Bors] - Lower the post k2pow in mainnet

[pigmej]

Lowering the k2pow in the mainnet config.

[codecov]

Codecov Report

Merging #4727 (7c0ab7b) into develop (0a9b323) will decrease coverage by 0.3%.
The diff coverage is 85.7%.

@@            Coverage Diff            @@
##           develop   #4727     +/-   ##
=========================================
- Coverage     77.2%   77.0%   -0.3%     
=========================================
  Files          255     255             
  Lines        28839   28844      +5     
=========================================
- Hits         22270   22211     -59     
- Misses        5182    5250     +68     
+ Partials      1387    1383      -4     

Impacted Files	Coverage Δ
config/mainnet.go	98.0% <0.0%> (ø)
activation/activation.go	78.0% <100.0%> (+<0.1%)	⬆️
activation/nipost_state.go	58.7% <100.0%> (+1.1%)	⬆️

... and 4 files with indirect coverage changes

[poszu]

bors merge

[bors]

Build failed (retrying...):

• ci-status

[bors]

Canceled.

[pigmej]

bors merge

[bors]

Pull request successfully merged into develop.

Build succeeded!

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• ci-status
• systest-status