Fix memory_usage() for ListSeries

[thomcom]

Description

This PR fixes the memory_usage() call for ListSeries. This is a bugfix. https://www.github.com/rapidsai/cuspatial/pull/585 depends on this. Perhaps it can get into branch-22.08?

Fixes #11346.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

Codecov Report

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@@               Coverage Diff               @@
##             branch-22.08   #11355   +/-   ##
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  Files                   ?      143           
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  Hits                    ?    19651           
  Misses                  ?     3095           
  Partials                ?        0           

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[thomcom]

@gpucibot merge