[ntuple] merging RNTuples produced with ROOT <= 6.34 fails

[silverweed]

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Description

The RNTupleMerger is currently using the "wrong" type name to compare fields (GetTypeName()). It should be using GetTypeNameForComparison() instead, in order to deal with RNTuples created pre-ROOT 6.36 that contain wrongly-normalized type names.

Reproducer

See https://root-forum.cern.ch/t/type-name-error-after-rntuple-merging/64827

ROOT version

master

Installation method

any

Operating system

any

Additional context

No response