removed device.close() call in Overlay.free()

[jogomojo]

This commit removed device.close() calls, but missed one in Overlay.free(), which was causing a deprecation warning to show when a user freed the overlay.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.11%. Comparing base (87d9557) to head (5cf6c71).
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Additional details and impacted files

@@              Coverage Diff              @@
##           image_v3.1.3    #1520   +/-   ##
=============================================
  Coverage         35.10%   35.11%           
=============================================
  Files                30       30           
  Lines              4649     4648    -1     
  Branches            814      814           
=============================================
  Hits               1632     1632           
+ Misses             2957     2956    -1     
  Partials             60       60           

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