editoast: fix some nightly clippy warnings

[leovalais]

warning: useless conversion to the same type: `WorkerStatus`
   --> editoast_osrdyne_client/src/lib.rs:163:30
    |
163 |                        .copied()
    |   ______________________________^
    |  |______________________________|
164 | ||                     .map(WorkerStatus::from)
    | ||____________________________________________^
165 | |                      .unwrap_or(WorkerStatus::Unscheduled);
    | |_____________________- help: consider removing
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
    = note: `#[warn(clippy::useless_conversion)]` on by default

warning: useless conversion to the same type: `models::timetable::Timetable`
  --> src/models/timetable.rs:46:19
   |
46 |                .await
   |   ___________________^
   |  |___________________|
47 | ||             .map(Into::into)
   | ||____________________________^
48 | |              .map_err(Into::into)
   | |_____________- help: consider removing
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
   = note: `#[warn(clippy::useless_conversion)]` on by default

warning: useless conversion to the same type: `error::InternalError`
   --> src/models/timetable.rs:135:34
    |
135 |                .map(|r| r.is_some())
    |   __________________________________^
    |  |__________________________________|
136 | ||             .map_err(Into::into)
    | ||________________________________^
137 | |      }
    | |_____- help: consider removing
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.87%. Comparing base (f2b3f8b) to head (2643600).
Report is 4 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10556      +/-   ##
==========================================
- Coverage   81.87%   81.87%   -0.01%     
==========================================
  Files        1073     1073              
  Lines      107106   107102       -4     
  Branches      730      730              
==========================================
- Hits        87690    87686       -4     
  Misses      19377    19377              
  Partials       39       39              

Flag	Coverage Δ
editoast	74.29% <100.00%> (-0.01%)	⬇️
front	89.39% <ø> (ø)
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	88.14% <ø> (ø)

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