Broken query for x/superfluid total_superfluid_delegations

[mattverse]

Current superfluid module does not delete intermediary accounts that are not being used(intermediary accounts without any delegations for superfluid).

Meanwhile, https://github.com/osmosis-labs/osmosis/blob/main/x/superfluid/keeper/grpc_query.go#L290-L319 TotalSuperfluidDelegations iterate through all intermediary accounts, and omits and error if there aren't delegations for the intermediary account.

Quick fix I propose: simply do not omit an error if delegation not found and pass, we might want further discussions on if we want to keep intermediary accounts or not in the future

[ValarDragon]

The proposed quick fix sounds great to me!

We'll have to think through edge cases around rounding before we can delete the intermediate account entirely in a future state machine change