Fix for temp iterator erroneously freeing returned iterator #1009
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This fixes the problem we were debugging in Discord. All tests now pass.
Turns out that there were iterators that were not being cleaned up because the test wasn't running the iterator to completion. But the memory leaks were being masked by the stack-allocator problem.
So fixing the problem caused the three tests to fail. Adding the additional
ecs_*_next()calls fixed the tests.