Superfluid Misc: Improve grpc_query

[mattverse]

Closes: #1080

Description

This PR introduces the following improvements for grpc_query in the superfluid module.

• Fix bug where non-existent connected-intermediary-account would still return an address
• Fix bug for total_supefluid_delegations

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

[codecov-commenter]

Codecov Report

Merging #1084 (85ed361) into main (f897502) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1084      +/-   ##
==========================================
+ Coverage   20.64%   20.84%   +0.19%     
==========================================
  Files         193      194       +1     
  Lines       25270    25331      +61     
==========================================
+ Hits         5218     5280      +62     
+ Misses      19096    19092       -4     
- Partials      956      959       +3     

Impacted Files	Coverage Δ
x/superfluid/keeper/grpc_query.go	56.28% <100.00%> (+9.73%)	⬆️
x/superfluid/keeper/hooks.go	66.66% <0.00%> (-5.56%)	⬇️
x/claim/keeper/hooks.go	25.92% <0.00%> (-2.08%)	⬇️
x/superfluid/keeper/invariants.go	54.05% <0.00%> (ø)
x/superfluid/keeper/intermediary_account.go	88.46% <0.00%> (+1.69%)	⬆️
x/superfluid/keeper/stake.go	58.13% <0.00%> (+4.65%)	⬆️
x/superfluid/keeper/keeper.go	100.00% <0.00%> (+6.25%)	⬆️

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[ValarDragon]

Thanks for the fixes here!