Fix some windows warnings (C4244 and C4305)

[Crola1702]

🦟 Bug fix

Fixes part of #1870

Summary

This PR fixes some warnings (C4244 and C4305) happening in ign-gazebo6 windows
Reference build: https://build.osrfoundation.org/job/ign_gazebo-ign-6-win/166/

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #1874 (0a99678) into ign-gazebo6 (68008d2) will decrease coverage by 0.02%.
The diff coverage is 35.71%.

@@               Coverage Diff               @@
##           ign-gazebo6    #1874      +/-   ##
===============================================
- Coverage        64.80%   64.78%   -0.02%     
===============================================
  Files              322      322              
  Lines            26389    26391       +2     
===============================================
- Hits             17101    17098       -3     
- Misses            9288     9293       +5     

Impacted Files	Coverage Δ
.../gui/plugins/transform_control/TransformControl.cc	7.36% <0.00%> (+0.01%)	⬆️
...rc/systems/ackermann_steering/AckermannSteering.cc	85.50% <71.42%> (-0.17%)	⬇️
src/SimulationRunner.cc	90.82% <0.00%> (-0.95%)	⬇️
src/Util.cc	93.44% <0.00%> (+0.32%)	⬆️

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[azeey]

signoffs don't work correctly when applying code suggestions, so you'll have to follow the instructions here to rebase your commits with signoffs to fix the DCO error.

[mjcarroll]

@osrf-jenkins retest this please

[mjcarroll]

LGTM, just running through CI one more time.

[Crola1702]

FYI: Commit 0a99678 fixes optical_tactile_plugin.cc test. I did kind of a backport from 0a84abe.

[Crola1702]

Homebrew test regressions are known issues reported here: #1867