Fix #412

[maltoze]

Currently, after a user login with AUTH_DB not redirect to intent url.
This will fix it.

related:
#412
apache/superset#1303

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@625725c). Click here to learn what that means.
The diff coverage is 50%.

@@            Coverage Diff            @@
##             master    #1195   +/-   ##
=========================================
  Coverage          ?   71.65%           
=========================================
  Files             ?       44           
  Lines             ?     6004           
  Branches          ?        0           
=========================================
  Hits              ?     4302           
  Misses            ?     1702           
  Partials          ?        0

Impacted Files	Coverage Δ
flask_appbuilder/security/views.py	54.51% <50%> (ø)

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[dpgaspar]

Thank you! can you please add the same logic on AuthLDAPView ?