fix: custom menu option

[dpgaspar]

Description

Fixes custom menu, based on: #1875

ADDITIONAL INFORMATION

• Has associated issue:
• Is CRUD MVC related.
• Is Auth, RBAC security related.
• Changes the security db schema.
• Introduces new feature
• Removes existing feature

[codecov]

Codecov Report

Merging #1884 (1cbafdc) into master (cc8e359) will increase coverage by 0.07%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1884      +/-   ##
==========================================
+ Coverage   77.67%   77.74%   +0.07%     
==========================================
  Files          70       70              
  Lines        8560     8560              
==========================================
+ Hits         6649     6655       +6     
+ Misses       1911     1905       -6     

Flag	Coverage Δ
python	77.74% <0.00%> (+0.07%)	⬆️

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

Impacted Files	Coverage Δ
flask_appbuilder/base.py	81.00% <0.00%> (+2.15%)	⬆️

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