fix test for sparse matrix assignment #32756
Merged
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This "test" was introduced in #30405, but (i) it doesn't test anything, and (ii) what was written returns false. Judging from #30006, I guess what was supposed to be tested is assignment to previous zero elements, not comparison. Anyway, please feel free to change to whatever is more meaningful.
Edit: those patches were backported, so this may apply here as well?