little fix - attr whitelist_IDs

[HomeAutoUser]

• Please check if the PR fulfills these requirements

• Tests for the changes have been added / modified (needed for for bug fixes / features)
• commandref has been added / updated (needed for bug fixes / features)
• CHANGED has been updated (needed for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Bug fix

• What is the current behavior? (You can also link to an open issue here)

• user selects protocols and clicks on "save to whitelist and close" and receives no information on an attribute change
• a shutdown restart without clicking "Save config" removes the setting

• What is the new behavior (if this is a feature change)?

• user receives a change notice to save the changed attributes

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

• Other information:

[codecov]

Codecov Report

Merging #983 (5b5e3d2) into master (2737c16) will decrease coverage by 0.00%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #983      +/-   ##
==========================================
- Coverage   58.65%   58.65%   -0.01%     
==========================================
  Files         107      107              
  Lines        8587     8588       +1     
  Branches     1341     1341              
==========================================
  Hits         5037     5037              
- Misses       2638     2639       +1     
  Partials      912      912              

Flag	Coverage Δ
fhem	48.66% <33.33%> (-0.01%)	⬇️
modules	58.65% <33.33%> (-0.01%)	⬇️
perl	91.57% <ø> (ø)
unittests	58.65% <33.33%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
FHEM/00_SIGNALduino.pm	62.00% <33.33%> (-0.04%)	⬇️

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[HomeAutoUser]

@sidey79 , wenn du ein kühles Päuschen hast ;)