Added the santos_step to SWFlow test suite for code coverage.

[ejtovar]

Mandatory Checklist

Please ensure that the following criteria are met:

• [x] Title of pull request describes the changes/features
• [x] Request at least 2 reviewers
• [x] If new files are being added, the files are no larger than 100kB. Post the file sizes.
• [x] Code coverage did not decrease. If this is a bug fix, a test should cover that bug fix. If a new feature is added, a test should be made to cover that feature.
• [x] New features have appropriate documentation strings (readable by sphinx)
• [x] Contributor has read and agreed with CONTRIBUTING.md and has added themselves to CONTRIBUTORS.md

As a general rule of thumb, try to follow PEP8 guidelines.

Description

Updating the SWFlow test suite to cover the santos_step.py test (along with updating the description in file). Also removed unnecessary lines in solitary_wave.py

New file

proteus/tests/SWFlow/comparison_files/comparison_santos_step_h_t2.csv -- 4kBs

[codecov[bot]]

Codecov Report

Merging #1227 into master will increase coverage by 0.07%. The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master    #1227      +/-   ##
==========================================
+ Coverage   52.22%   52.29%   +0.07%     
==========================================
  Files         531      531              
  Lines      109522   109521       -1     
==========================================
+ Hits        57196    57274      +78     
+ Misses      52326    52247      -79     

Impacted Files	Coverage Δ
proteus/tests/SWFlow/santos_step.py	92.77% <0.00%> (+92.77%)	:arrow_up:
proteus/tests/SWFlow/solitary_wave.py	93.75% <ø> (-0.16%)	:arrow_down:
proteus/tests/SWFlow/test_SWFlows.py	100.00% <100.00%> (ø)

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