fix: next url on login (OAuth, OID, DB)

[dpgaspar]

Description

Fixes next URL logic for OAuth, OID and DB

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 #1804 (2bca590) into master (dd560f8) will increase coverage by 0.05%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master    #1804      +/-   ##
==========================================
+ Coverage   77.06%   77.11%   +0.05%     
==========================================
  Files          56       56              
  Lines        8226     8229       +3     
==========================================
+ Hits         6339     6346       +7     
+ Misses       1887     1883       -4     

Flag	Coverage Δ
python	77.11% <85.71%> (+0.05%)	⬆️

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Impacted Files	Coverage Δ
flask_appbuilder/security/views.py	62.56% <73.33%> (+0.06%)	⬆️
flask_appbuilder/utils/base.py	93.33% <100.00%> (+5.09%)	⬆️

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