remove noop code that merge nil tracing context

The semantic of `SetTracingContext`'s implementation is merging,
merging a nil map is a noop, so this code seems do nothing.

CHANGELOG.md

@@ -89,6 +89,7 @@ Every module contains its own CHANGELOG.md. Please refer to the module you are i
 * (types) [#18963](https://github.com/cosmos/cosmos-sdk/pull/18963) Swap out amino json encoding of `ABCIMessageLogs` for std lib json encoding
 * (x/auth) [#19651](https://github.com/cosmos/cosmos-sdk/pull/19651) Allow empty public keys in `GetSignBytesAdapter`.
 * (x/genutil) [#19735](https://github.com/cosmos/cosmos-sdk/pull/19735) Update genesis api to match new `appmodule.HasGenesis` interface.
+* (baseapp) [#19893](https://github.com/cosmos/cosmos-sdk/pull/19893) Remove the noop code that merge empty tracing context.
 
 ### Bug Fixes
 

baseapp/abci.go

@@ -833,10 +833,6 @@ func (app *BaseApp) internalFinalizeBlock(ctx context.Context, req *abci.Request
 		txResults = append(txResults, response)
 	}
 
-	if app.finalizeBlockState.ms.TracingEnabled() {
-		app.finalizeBlockState.ms = app.finalizeBlockState.ms.SetTracingContext(nil).(storetypes.CacheMultiStore)
-	}
-
 	endBlock, err := app.endBlock(app.finalizeBlockState.Context())
 	if err != nil {
 		return nil, err