CMCL-1629: pantilt recentering was ignoring axis center setting

[glabute]

Purpose of this PR

CMCL-1629: PanTilt recentering was ignoring axis center setting. Was using hardcoded (0, 0).

Testing status

• Added an automated test
• Passed all automated tests
• Manually tested

Documentation status

• Updated CHANGELOG
• Updated README (if applicable)
• Commented all public classes, properties, and methods
• Updated user documentation

Technical risk

low

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 27.21%. Comparing base (ba4cc2b) to head (f955c06).
Report is 74 commits behind head on main.

Files with missing lines	Patch %	Lines
...nemachine/Runtime/Components/CinemachinePanTilt.cs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1029      +/-   ##
==========================================
+ Coverage   26.97%   27.21%   +0.24%     
==========================================
  Files         254      254              
  Lines       28418    28485      +67     
==========================================
+ Hits         7665     7753      +88     
+ Misses      20753    20732      -21     

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