Addressing issues with admin user creation

[cweinberger]

Fixes

• Admin users created via Admin Panel backend can sign in now (removed double-hashing of passwords)
• Checkboxes for sending credentials to the user and forcing a password reset work properly now (fixed typo in .leaf-file and added proper bool-parsing for leaf checkbox)
• Admin users can be edited without changing their email address (added missing userId needed for proper validation)

[codecov[bot]]

Codecov Report

Merging #71 into master will decrease coverage by <.01%. The diff coverage is 0%.

@@            Coverage Diff            @@
##           master     #71      +/-   ##
=========================================
- Coverage    2.06%   2.06%   -0.01%     
=========================================
  Files          45      46       +1     
  Lines        1935    1940       +5     
=========================================
  Hits           40      40              
- Misses       1895    1900       +5

Impacted Files	Coverage Δ
...ces/AdminPanelProvider/Models/AdminPanelUser.swift	0% <0%> (ø)	:arrow_up:
...AdminPanelProvider/Models/AdminPanelUserForm.swift	0% <0%> (ø)	:arrow_up:
...rces/AdminPanelProvider/Helpers/Content+Bool.swift	0% <0%> (ø)

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