pyxrt close() fix

[jogomojo]

Fixes #1496

The old xrt Python bindings required explicit cleanup of handles. This is no longer the case in the new pyxrt, which does not have the same functionality. This was causing issues with PYNQ code where device.close() was called.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.11%. Comparing base (b93954c) to head (050cd4b).
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Additional details and impacted files

@@               Coverage Diff                @@
##           image_v3.1.1    #1511      +/-   ##
================================================
+ Coverage         35.10%   35.11%   +0.01%     
================================================
  Files                30       30              
  Lines              4652     4650       -2     
  Branches            815      814       -1     
================================================
  Hits               1633     1633              
+ Misses             2959     2957       -2     
  Partials             60       60              

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