Fix AddingTagsEditor Bug

[AndresOrtegaGuerrero]

This fix the bug reported previously in #541 , somehow it returned

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (09ba7d0) 80.73% compared to head (86c835c) 80.73%.

Files	Patch %	Lines
src/aiidalab_qe/common/widgets.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #574   +/-   ##
=======================================
  Coverage   80.73%   80.73%           
=======================================
  Files          49       49           
  Lines        3415     3415           
=======================================
  Hits         2757     2757           
  Misses        658      658           

Flag	Coverage Δ
python-3.10	80.73% <0.00%> (ø)
python-3.8	80.77% <0.00%> (ø)
python-3.9	80.77% <0.00%> (ø)

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[unkcpz]

Looks good to me. thanks!