Fix setting Radius secret key in dialog

[swaterkamp]

What:
Use value of dialog internal state for secret key in radius dialog

Why:
The value was fixed and unchangeable.

How:

Checklist:

• Tests
• CHANGELOG Entry
• Labels for ports to other branches

[codecov]

Codecov Report

Merging #2891 (db2c8a2) into gsa-21.04 (74a1fd3) will increase coverage by 0.01%.
The diff coverage is 77.55%.

@@              Coverage Diff              @@
##           gsa-21.04    #2891      +/-   ##
=============================================
+ Coverage      53.83%   53.84%   +0.01%     
=============================================
  Files           1075     1075              
  Lines          26226    26246      +20     
  Branches        7491     7504      +13     
=============================================
+ Hits           14118    14133      +15     
- Misses         10993    10996       +3     
- Partials        1115     1117       +2     

Impacted Files	Coverage Δ
gsa/src/web/pages/notes/dialog.js	4.87% <ø> (ø)
gsa/src/web/pages/nvts/solution.js	22.22% <0.00%> (-11.12%)	⬇️
gsa/src/web/pages/radius/dialog.js	66.66% <ø> (ø)
gsa/src/web/pages/results/dashboard/index.js	75.00% <ø> (ø)
gsa/src/web/pages/results/details.js	6.74% <0.00%> (-0.16%)	⬇️
gsa/src/web/pages/targets/details.js	10.00% <ø> (ø)
gsa/src/web/pages/usersettings/dialog.js	29.41% <ø> (ø)
gsa/src/web/pages/scanners/dialog.js	70.31% <66.66%> (+0.47%)	⬆️
gsa/src/gmp/models/certbund.js	100.00% <100.00%> (ø)
gsa/src/gmp/models/cpe.js	94.73% <100.00%> (-0.27%)	⬇️
... and 10 more

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[cfi-gb]

Closes #2862 ?

[swaterkamp]

This is a draft it has yet to be determined.