bpf: selftests: Remove unused 'nospace_err' in tests for batched ops in array maps

This seems to be a reminiscent from the hashmap tests.

Signed-off-by: Pedro Tammela <pctammela@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210315132954.603108-1-pctammela@gmail.com