ign -> gz : Remove redundant namespace references

[methylDragon]

Part of: gazebo-tooling/release-tools#784

[codecov]

Codecov Report

Merging #258 (bb69dfd) into ign-sensors3 (6e0b3ae) will not change coverage.
The diff coverage is 70.76%.

❗ Current head bb69dfd differs from pull request most recent head 9a24fac. Consider uploading reports for the commit 9a24fac to get more accurate results

@@              Coverage Diff              @@
##           ign-sensors3     #258   +/-   ##
=============================================
  Coverage         77.57%   77.57%           
=============================================
  Files                23       23           
  Lines              2377     2377           
=============================================
  Hits               1844     1844           
  Misses              533      533           

Impacted Files	Coverage Δ
src/ThermalCameraSensor.cc	57.39% <42.85%> (ø)
src/DepthCameraSensor.cc	74.48% <50.00%> (ø)
src/CameraSensor.cc	75.37% <64.28%> (ø)
src/LogicalCameraSensor.cc	90.14% <75.00%> (ø)
src/Manager.cc	72.97% <75.00%> (ø)
src/RgbdCameraSensor.cc	75.21% <77.77%> (ø)
src/AirPressureSensor.cc	86.30% <100.00%> (ø)
src/AltimeterSensor.cc	88.50% <100.00%> (ø)
src/GaussianNoiseModel.cc	98.30% <100.00%> (ø)
src/ImuSensor.cc	90.38% <100.00%> (ø)
... and 2 more

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