Add NOT IN ontology filter

[haideriqbal]

Fixes #1021

The best way to fix this issue is to declare the ExcludeFilter class as a static nested class. Specifically, in OlsSolrQuery.java (lines 181–192), replace the private class ExcludeFilter { ... } declaration with private static class ExcludeFilter { ... }. This ensures that instances of ExcludeFilter do not hold an implicit reference to an instance of the outer OlsSolrQuery class. No changes to methods, imports, or functionality are required, as ExcludeFilter does not access any instance members of the enclosing class.

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[haideriqbal]

Now we have a scrollable list of ontologies in the filter sorted by descending order... If we select anything from one the filter other one become greyed out.