bigarray: Fix flaky test in test_bigarray_indexing_1d
We compare A_[10*PS-1] (which is A_) to 0, but A_= ndarray ((10*PS,), uint8) and that means the array memory is not initialized. So the comparison works sometimes and sometimes it does not. Initialize compared element explicitly. NOTE: A (without _) element does not need to be initialized - because not-initialized BigArray parts read as zeros.
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