Avoid obsoletion warning suppression in ActiveXHost

[h3xds1nz]

Description

Avoids warning suppression for ApartmentState property by using the newer method instead. In the retrieval (get) context, checking for STA has no behavioral difference between those two, hence no reason to NOT use it.

Also, this is the only place in WPF where the swap to the method hasn't been done yet.

Customer Impact

Cleaner codebase for developers, not using BCL obsoleted methods.

Regression

No.

Testing

Local build.

Risk

Low.

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

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

Project coverage is 11.25335%. Comparing base (4aff730) to head (5a92c44).
Report is 5 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #10689         +/-   ##
===================================================
- Coverage   11.28308%   11.25335%   -0.02974%     
===================================================
  Files           3353        3353                 
  Lines         668062      668041         -21     
  Branches       74980       74980                 
===================================================
- Hits           75378       75177        -201     
- Misses        591433      591616        +183     
+ Partials        1251        1248          -3     

Flag	Coverage Δ
Debug	11.25335% <0.00000%> (-0.02974%)	⬇️

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