Index definition extraction from content packages is missing binary files data

Currently, binaries are stored in indexDefinitions at [1] and these binaries should be written in JSONOutput at [2], However each time we are getting it as empty at [2].

The reason is that we are storing binaries against its repositoryPath instead it should be its parent path.

i.e we are storing tika config.xml binaries at repositoryPath
`oak:index/damAssetLucene-8-custom-2/tika/config.xml`
and while writing at [2],we are trying to fetch it from `oak:index/damAssetLucene-8-custom-2/tika/`
because of this we are getting it as empty as nodeName is till `oak:index/damAssetLucene-8-custom-2/tika` only.

[1]:https://github.com/niekraaijmakers/sling-org-apache-sling-feature-cpconverter/blob/master/src/main/java/org/apache/sling/feature/cpconverter/handlers/IndexDefinitionsEntryHandler.java
[2]:https://github.com/niekraaijmakers/sling-org-apache-sling-feature-cpconverter/blob/master/src/main/java/org/apache/sling/feature/cpconverter/index/IndexDefinitionsJsonWriter.java#L137