Issues tuning some 8.33 kHz frequencies

[ltoenning]

From FS9 user report:

• Tuning 130.235 fails as swift automatically resets to 130.230
• Tuning 132.910 and 132.900 is working
• Tuning 132.905 does not work as swift falls back to 132.900

https://discord.com/channels/539048679160676382/539486489977946112/1222283431178670160

The FS9 implementation employs a different approach in handling the tuning of 8.33 frequencies compared to fsxcommon.

See also 2f3dc5a