Fix SSO redirection

[Convly]

What does it do?

Redirect URLs for SSO were missing a default "admin" value since the route has changed for the V4.

Why is it needed?

Redirect for SSO is broken. See #12328

How to test it?

See #12328

Related issue(s)/PR(s)

fix #12328

[soupette]

LGTM

[codecov]

Codecov Report

Merging #12340 (831b7eb) into master (90d3c76) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #12340   +/-   ##
=======================================
  Coverage   47.76%   47.76%           
=======================================
  Files         210      210           
  Lines        8140     8140           
  Branches     1836     1836           
=======================================
  Hits         3888     3888           
  Misses       3503     3503           
  Partials      749      749           

Flag	Coverage Δ
front	?
unit	47.76% <ø> (ø)

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