Bug fix/24 hour shift timing

[RHammond2]

This PR fixes an issue where servicing equipment are waiting for the next shift despite having a start and end time of 0 and 24, respectively, to indicate a continuous shift. See the changelog for details.

[codecov[bot]]

Codecov Report

Merging #96 (0057ecf) into develop (f2d824f) will increase coverage by 0.01%. The diff coverage is 88.00%.

@@             Coverage Diff             @@
##           develop      #96      +/-   ##
===========================================
+ Coverage    54.88%   54.90%   +0.01%     
===========================================
  Files           21       21              
  Lines         3458     3475      +17     
  Branches       697      704       +7     
===========================================
+ Hits          1898     1908      +10     
- Misses        1447     1452       +5     
- Partials       113      115       +2     

Impacted Files	Coverage Δ
wombat/core/port.py	16.45% <0.00%> (+0.20%)	:arrow_up:
wombat/core/data_classes.py	85.66% <84.61%> (-0.03%)	:arrow_down:
wombat/core/mixins.py	64.86% <100.00%> (+2.00%)	:arrow_up:
wombat/core/service_equipment.py	60.30% <100.00%> (-1.05%)	:arrow_down: