get_object_taxonomies returns all taxonomies on object_type 0

[nbachiyski]

Expected:
Calling get_object_taxonomies(0)}} returns an array of taxonomies with object_type equal to {{{0.

Actual:
Calling {{{get_object_taxonomies(0)}} returns an array of all taxonomies.

Since for php 0 == 'baba' we have to use strict equal to catch errors like these. Patch attached.

[nbachiyski]

Oh, and I forgot to mention: actually Alex Shiels found that through a unit test.

[ryan]

(In [6355]) Don't return all taxonomies for an object type of 0. Props tellyworth and nbachiyski. fixes #5417