Fix misleading-indentation warning in SerializationTraversal

[LK-Simon]

Summary

ESPressio_SerializationTraversal.hpp currently contains a statement sequence that triggers -Wmisleading-indentation under GCC when downstream consumers compile with warnings-as-errors:

if(!FromNode(node,value))fail(); return result;

This was exposed by ESPressio Serial's host test suite while validating against released Serializable 0.10.1.

Impact

Downstream projects using -Werror fail to compile even though the logic itself is unchanged.

Required fix

Reformat the branch so control flow is unambiguous, e.g.:

if (!FromNode(node, value)) {
    fail();
}
return result;

No API or behavioural change is intended.

Release

Target patch release: 0.10.2.