[MergeDups] Allow actions from sidebar of protected sense

[imnasnainaec]

Fixes #3521

To test:

• import/open a project with protected senses (e.g. Natqgu.zip)
• go to Merge Duplicates
• find a set with at least one protected and one non-protected sense
• drag'n'drop a non-protected sense into a protected sense
• when the sidebar pops open, drag the secondary sense out of the sidebar and into any word
• drag'n'drop the non-protected sense back into a protected senses
• when the sidebar opens, drag the secondary sense into the trash and confirm deletion

---

This change is 

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 74.50%. Comparing base (d121eb5) to head (9aee4d6).
Report is 31 commits behind head on master.

Files with missing lines	Patch %	Lines
...geDuplicates/MergeDupsStep/MergeDragDrop/index.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3561      +/-   ##
==========================================
- Coverage   74.54%   74.50%   -0.05%     
==========================================
  Files         285      285              
  Lines       11005    11005              
  Branches     1332     1332              
==========================================
- Hits         8204     8199       -5     
- Misses       2419     2423       +4     
- Partials      382      383       +1     

Flag	Coverage Δ
backend	83.77% <ø> (-0.10%)	⬇️
frontend	66.32% <0.00%> (ø)

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[andracc]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)