chore: fix struct name in comment

Signed-off-by: tiaoxizhan <[email protected]>

Author: tiaoxizhan

x/wasm/types/wasmer_engine.go

@@ -277,7 +277,7 @@ type WasmEngine interface {
 		deserCost wasmvmtypes.UFraction,
 	) (*wasmvmtypes.IBCBasicResult, uint64, error)
 
-	// IBCSourceCallback is available on IBC-callbacks-enabled contracts and is called when an
+	// IBCDestinationCallback is available on IBC-callbacks-enabled contracts and is called when an
 	// IBC-callbacks-enabled IBC message previously sent by this contract is either acknowledged or
 	// times out.
 	IBCDestinationCallback(