Remove: non-adhesive

[pbuttigieg]

non-adhesive (PATO:0002332) seems like it shouldn't be in an ontology, especially as a subclass of adhesivity (PATO:0001431).

If adhesivity is "...[a] disposition to exhibit molecular attraction to another entity in contact" then "...not exhibiting molecular attraction to another entity in contact." (def non-adhesive) doesn't seem to make sense as a subclass (or even a class in itself).