fix: Move calls to env() out of UsersTableSeeder

[cbj4074]

env() calls should be made only from within config files.

Note that the 'owner-username' is not prepended with 'default-' because,
unlike the other two values, it should not be changed after
installation, specifically because the account should always be
looked-up by username and not ID (despite existing code that currently
does the latter).

[codecov]

Codecov Report

Merging #1202 into master will decrease coverage by 1.12%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #1202      +/-   ##
============================================
- Coverage     25.66%   24.54%   -1.13%     
  Complexity     4140     4140              
============================================
  Files           296      296              
  Lines         13109    13109              
============================================
- Hits           3365     3217     -148     
- Misses         9744     9892     +148

Impacted Files	Coverage Δ	Complexity Δ
app/Http/Controllers/ContactController.php	0% <0%> (ø)	2 <0> (ø)	⬇️
app/Jobs/ProcessMassPM.php	0% <0%> (-100%)	2% <0%> (ø)
app/Services/Data/Person.php	0% <0%> (-87.5%)	7% <0%> (ø)
app/Services/Data/Genre.php	0% <0%> (-60%)	7% <0%> (ø)
app/Services/Clients/TmdbClient.php	5.52% <0%> (-51.16%)	89% <0%> (ø)
app/Services/Clients/Client.php	60% <0%> (-26.67%)	15% <0%> (ø)
app/Services/Data/Movie.php	17.46% <0%> (-14.29%)	40% <0%> (ø)
...pp/Http/Controllers/Staff/MassActionController.php	63.63% <0%> (-6.07%)	6% <0%> (ø)
app/Http/Controllers/API/TorrentController.php	65.67% <0%> (-2.49%)	83% <0%> (ø)
app/Models/User.php	36.11% <0%> (-1.2%)	122% <0%> (ø)
... and 5 more

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