Unchecking "is a view of" during ontology edit has no effect

[jvendetti]

Steps to reproduce:

• Log into BioPortal and select an ontology that's been created as a view of another ontology
• Click the "Edit ontology details" button to edit ontology metadata
• Untick the checkbox "This ontology is a view of", and save

This sequence of steps has no effect. After the save, the application returns to the ontology summary page, and the ontology is still listed as a view of another ontology.

[syphax-bouazzouni]

This is ontoportal-lirmm/ontologies_api#48, a fix to that (coming with a test reproducing it)