Refs #32940 -- Removed unnecessary branch in Node.add().

The "data in self.children" branch was causing data.__eq__ to be
called for each entries in "self.children" which resulted in a huge
slowdown during queryset construction.

It's purpose was to prevent queries of the form
    Model.objects.filter(foo='bar').filter(foo='bar')
from resulting in
    WHERE foo='bar' AND foo='bar'
but it's not covered by the suite and has arguable performance benefits
since it's not very common and SQL engines are usually very good at
folding/optimizing these.

See also #32632 for prior discussion around comparing data to the
Node's children.

Co-authored-by: Nick Pope <nick@nickpope.me.uk>

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