fix up refcount/properties test case
Recent changes to the properties testcase made invalid use of the GArray free function. This free function takes a pointer to the item to be freed, not the item itself. Since that item was a pointer to a GObject, g_object_unref() was getting a GObject**, rather than a GObject*. The use of GArray in this testcase is pretty questionable in the first place, so just use C arrays instead.
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