Fix solr compare records output

[kouralex]

Running ./console solr:compare-records after indexing a direct file import and importing them again via the same file results in displaying excessive changes. It seems like some fields are created internally by Solr whilst indexing and those do not exist from RecordManager's view for some reason.

[EreMaijala]

Adding callnumber-search makes sense, but unless I missed something the rest of the fields are only present in the downstream Finna-specfic version and should be listed there, if anywhere. Note that you can always add any desired fields to the ignore_in_comparison setting in [Solr] section of recordmanager.ini.

[kouralex]

Good catch and note taken. I dropped all the other fields except title_txtP and callnumber-search as those two were consistently reported by the command when using the correct upstream version of RecordManager.

[EreMaijala]

This still isn't quite right. title_txtP is a Finna-specific field that's not present in upstream VuFind's Solr schema, so it should not be included in the defaults.