Disable clone icon for superadmin users on listpages and detailspages

[swaterkamp]

What:
Disable the clone icon for superadmin users.

Why:
Superadmins can't be cloned, it doesn't make sense to offer the option just to throw an error.

How:

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #2634 (5af7773) into gsa-20.08 (2f34292) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           gsa-20.08    #2634   +/-   ##
==========================================
  Coverage      53.06%   53.07%           
==========================================
  Files           1072     1072           
  Lines          25900    25904    +4     
  Branches        7372     7372           
==========================================
+ Hits           13744    13748    +4     
  Misses         11034    11034           
  Partials        1122     1122           

Impacted Files	Coverage Δ
gsa/src/web/pages/users/detailspage.js	33.33% <ø> (ø)
gsa/src/web/pages/users/row.js	26.66% <ø> (ø)
gsa/src/gmp/models/user.js	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update be0ffc9...5af7773. Read the comment docs.