Update the complex object logging example once the TFM warning is fixed

[reyang]

Package

None

Is your feature request related to a problem?

Currently the complex object logging demo has to set a specific property to suppress build time warnings. Once dotnet/extensions#5162 is fixed, the workaround can be removed.

What is the expected behavior?

The SuppressTfmSupportBuildWarnings setting is removed from the example. Refer to dotnet/extensions#5162.

Which alternative solutions or features have you considered?

N/A

Additional context

No response