Fix re-encrypting tabs loaded with other plugins

[hluk]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 91.17647% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.03%. Comparing base (9af4933) to head (b9b9b30).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/gui/mainwindow.cpp	82.35%	3 Missing ⚠️
src/item/serialize.cpp	66.66%	2 Missing ⚠️
src/gui/encryptionpassword.cpp	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3350      +/-   ##
==========================================
+ Coverage   79.95%   80.03%   +0.07%     
==========================================
  Files         238      238              
  Lines       29673    29710      +37     
==========================================
+ Hits        23726    23779      +53     
+ Misses       5947     5931      -16     

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