Fix view angle plugin

[jennuine]

🦟 Bug fix

Summary

Replaced IgnSpinBox with GzSpinBox, which was causing the plugin to fail to load. Also adjusted the minimumHeight to correctly view all contents and replaced ignmsg/err with gzmsg/err.

Before updating minimumHeight:

After:

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 #1877 (d38866c) into gz-sim7 (af73ebe) will increase coverage by 0.04%.
The diff coverage is n/a.

❗ Current head d38866c differs from pull request most recent head 2ea163b. Consider uploading reports for the commit 2ea163b to get more accurate results

@@             Coverage Diff             @@
##           gz-sim7    #1877      +/-   ##
===========================================
+ Coverage    64.64%   64.69%   +0.04%     
===========================================
  Files          343      343              
  Lines        27542    27542              
===========================================
+ Hits         17805    17817      +12     
+ Misses        9737     9725      -12     

Impacted Files	Coverage Δ
src/SimulationRunner.cc	92.15% <0.00%> (+1.88%)	⬆️

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[iche033]

@j-rivero or @caguero, gz-sim ubuntu builds are failing in garden and harmonic and complains about errors processing gz-transport 12 nightlies. Do you think it's related to gazebo-tooling/release-tools#872 or gazebo-tooling/release-tools#873?

[iche033]

Changes look good. Just need to get CI green