editoast: rename and invert authorization flag for consistency

[hamz2a]

Renames disable_authorization to enable_authorization and inverts its logic for better clarity.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 40.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 81.80%. Comparing base (d651580) to head (d4cb9a2).
Report is 17 commits behind head on dev.

Files with missing lines	Patch %	Lines
editoast/src/client/runserver.rs	0.00%	4 Missing ⚠️
editoast/src/views/mod.rs	60.00%	2 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff            @@
##              dev   #10509    +/-   ##
========================================
  Coverage   81.80%   81.80%            
========================================
  Files        1073     1073            
  Lines      106604   106718   +114     
  Branches      730      730            
========================================
+ Hits        87208    87304    +96     
- Misses      19357    19375    +18     
  Partials       39       39            

Flag	Coverage Δ
editoast	74.28% <40.00%> (-0.02%)	⬇️
front	89.34% <ø> (+<0.01%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.05% <ø> (ø)

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[woshilapin]

Small but useful improvement. Thank you.