stdlib: Make ets_SUITE memory check try again

as memory stats do not guarantee consistency.

A typical ETS test case ends by a lot of deallocating
that may now trigger homecoming carrier migration,
that in turn can cause quite large inconsistencies
in memory stats when same carrier is accounted for twice
or not at all.

And that's my theory why I now sometimes see transient discrepancies
between before and after memory stats.

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