Turbulent viscosity ratio bc setting has wrong name

[dnwillia-work]

See my comment here:

https://github.com/ansys/pyfluent/pull/2214#discussion_r1393553651

I've confirmed with @gyeole that this is a Fluent side issue.

[mkundu1]

This is fixed in 24.2 (we have some unittests covering this), closing.