fix(mvc): action confirmation on single show view

[dpgaspar]

Description

Fixes: #1529

Action confirmation set to None is not respected when using single on a show view

ADDITIONAL INFORMATION

• Has associated issue: Confirmation still shown from a record view on an ModelView action #1529
• Is CRUD MVC related.
• Is Auth, RBAC security related.
• Changes the security db schema.
• Introduces new feature
• Removes existing feature

[codecov]

Codecov Report

Merging #1539 (2b9f40e) into master (3d3c251) will increase coverage by 0.32%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1539      +/-   ##
==========================================
+ Coverage   72.75%   73.07%   +0.32%     
==========================================
  Files          46       46              
  Lines        6354     6463     +109     
==========================================
+ Hits         4623     4723     +100     
- Misses       1731     1740       +9     

Flag	Coverage Δ
python	73.07% <0.00%> (+0.32%)	⬆️

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

Impacted Files	Coverage Δ
flask_appbuilder/security/manager.py	59.50% <0.00%> (+1.66%)	⬆️
flask_appbuilder/security/registerviews.py	31.88% <0.00%> (-0.97%)	⬇️
flask_appbuilder/security/views.py	55.96% <ø> (+1.36%)	⬆️
flask_appbuilder/security/mongoengine/models.py	89.33% <0.00%> (-3.73%)	⬇️
flask_appbuilder/models/mongoengine/interface.py	77.50% <0.00%> (-0.39%)	⬇️
flask_appbuilder/api/schemas.py	100.00% <0.00%> (ø)
flask_appbuilder/baseviews.py	89.86% <0.00%> (+0.01%)	⬆️
flask_appbuilder/api/__init__.py	97.59% <0.00%> (+0.02%)	⬆️
flask_appbuilder/models/sqla/interface.py	78.84% <0.00%> (+0.03%)	⬆️
flask_appbuilder/api/convert.py	91.53% <0.00%> (+0.06%)	⬆️
... and 14 more

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