Bugfix/ParameterManager_was_losing_name_attribute_when_filtering

[Ashwolaa]

The implementation on the filtering was working directly on self.settings.

However, using the show method on the root element leads to some weird behavior resulting in losing the name of the settings.

This then leads to some issues for the saving/loading/updating as the xml format is not adapted to empty empty first element.

This PR now only apply filter on self.settings.children() to avoid it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.65%. Comparing base (873134c) to head (8e755ec).
⚠️ Report is 11 commits behind head on 5.0.x_dev.

Additional details and impacted files

@@              Coverage Diff              @@
##           5.0.x_dev     #107      +/-   ##
=============================================
+ Coverage      63.63%   63.65%   +0.01%     
=============================================
  Files             74       74              
  Lines           9064     9068       +4     
=============================================
+ Hits            5768     5772       +4     
  Misses          3296     3296              

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