Fix folder issue

[vrymar]

Fix issue #21.

• Import dashboard into a Grafana folder doesn't work #21

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (main@fbf4026). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
grafana_import/util.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #22   +/-   ##
=======================================
  Coverage        ?   69.33%           
=======================================
  Files           ?        5           
  Lines           ?      424           
  Branches        ?        0           
=======================================
  Hits            ?      294           
  Misses          ?      130           
  Partials        ?        0           

Flag	Coverage Δ
unittests	69.33% <83.33%> (?)

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[amotl]

Thank you very much! I've slightly amended your patch to make it pass CI, and hope it is semantically still correct.