refactor(claim): add checks in genesis validate for already completed missions

[lumtis]

Already completed missions are now taken into account for checking the airdrop supply value

Add some other improvements

[codecov]

Codecov Report

Merging #877 (8a5ad75) into develop (b6a5d1d) will increase coverage by 0.02%.
The diff coverage is 80.55%.

@@             Coverage Diff             @@
##           develop     #877      +/-   ##
===========================================
+ Coverage    10.43%   10.45%   +0.02%     
===========================================
  Files          326      326              
  Lines        76261    76273      +12     
===========================================
+ Hits          7957     7975      +18     
+ Misses       68113    68109       -4     
+ Partials       191      189       -2     

Impacted Files	Coverage Δ
x/claim/types/genesis.go	78.57% <78.78%> (+11.18%)	⬆️
x/claim/keeper/mission.go	96.20% <100.00%> (ø)
x/claim/types/claim_record.go	100.00% <100.00%> (ø)
x/campaign/simulation/store.go	83.10% <0.00%> (+2.02%)	⬆️

[Pantani]

💪

can you run make format before the merge?

[lumtis]

Thanks for the approval @Pantani

I'm merging it now as #835 depends on it in some way