Ensure superadmins can edit themselves

[mattmundell]

What:

Skip elements in MODIFY_USER that would prevent a superadmin from saving themself.

Why:

Superadmins should be able to edit themselves.

How:

Login as superadmin s. Menu > Users. Click edit icon for user s. Edit comment. Click Save.

Checklist:

• Tests N/A
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #2633 (08f8379) into gsa-20.08 (2f34292) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           gsa-20.08    #2633   +/-   ##
==========================================
  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)

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