test(campaign): add tests for CampaignSummary

[giunatale]

Closes #650

also fixes a misconfigured flags for a query in the CLI

I paid particular attention to keep code coverage as high as possible

[codecov]

Codecov Report

Merging #766 (f114dae) into develop (67ab845) will increase coverage by 0.18%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #766      +/-   ##
===========================================
+ Coverage    11.08%   11.27%   +0.18%     
===========================================
  Files          281      281              
  Lines        64148    64146       -2     
===========================================
+ Hits          7114     7233     +119     
+ Misses       56870    56742     -128     
- Partials       164      171       +7     

Impacted Files	Coverage Δ
x/campaign/client/cli/query_campaign_summary.go	78.18% <100.00%> (+78.18%)	⬆️
x/campaign/keeper/grpc_campaign_summary.go	89.41% <100.00%> (+89.41%)	⬆️