Fix DefaultUnbondingTime parameter to 3 weeks

[ggomma]

cosmos-sdk's default unbonding time is 3 weeks as used right now.
But the code is written as 3 days.
DefaultUnbondingTime time.Duration = time.Second * 60 * 60 * 24 * 3

It would be better to fix this line to 3weeks
DefaultUnbondingTime time.Duration = time.Second * 60 * 60 * 24 * 7 * 3

[codecov]

Codecov Report

Merging #4712 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4712      +/-   ##
==========================================
- Coverage   54.15%   54.14%   -0.02%     
==========================================
  Files         272      272              
  Lines       17349    17349              
==========================================
- Hits         9395     9393       -2     
- Misses       7271     7273       +2     
  Partials      683      683

[codecov]

Codecov Report

Merging #4712 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4712      +/-   ##
==========================================
- Coverage   54.15%   54.14%   -0.02%     
==========================================
  Files         272      272              
  Lines       17349    17349              
==========================================
- Hits         9395     9393       -2     
- Misses       7271     7273       +2     
  Partials      683      683

[cwgoes]

ACK, good catch on the comment discrepancy

[alessio]

I reckon this is worth a changelog entry - please the clog tool for such task: go get github.com/cosmos/tools/cmd/clog/

[alexanderbez]

Bump @ggomma 😄

[rigelrozanski]

please add changelog entry though

[jackzampolin]

Is this blocked on anything? We should go ahead and merge this.

[fedekunze]

let's open a new PR with the pending entry then

[fedekunze]

Moved to #4823. Sorry @ggomma but we want to fix this for the next release candidate