Remove mono-simulating `ComputeDispatchFeesAsTopLevel` flag

### Problem

We simulated an inconsequential quirk of mono-service fee charging [here](https://github.com/hashgraph/hedera-services/blob/develop/hedera-node/hedera-app/src/main/java/com/hedera/node/app/fees/FeeCalculatorImpl.java#L117); but don't need to do so anymore and can remove the enabling `ComputeDispatchFeesAsTopLevel` enum.

### Solution

Remove all uses of this enum.

### Alternatives

_No response_

Start at hedera-node/hedera-app/src/main/java/com/hedera/node/app/fees/FeeCalculatorImpl.java around line 117, then search the repository for all uses of the ComputeDispatchFeesAsTopLevel enum. Remove every use of the enum and verify that the affected build or tests still pass.

Written by the indexing model from the issue text.